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C
Cardinal & Co. Builders · Austin
CJ
Caroline & James
§
The cistern pump cycled twice last night — slight pressure drop.  Likely the float switch wants service. Driscoll & Sons can come Friday morning, or we can route it to your monthly walkthrough.
Year Two · In Residence

The Rollingwood House

Limestone, white oak, and blackened steel folded around a single live oak — a Hill Country home built for indoor-outdoor living in Rollingwood, Texas.
Built
2024
Floor area
4,800sf
Land
0.6acres
Climate zone
2Ahot · humid
30.275° N   ·   97.785° W
Net-Positive · Drought-Conscious
Right Now

Live from the home

A quiet readout of what the home is doing this moment — the sky outside, the air inside, the grid, the cistern, the sun on the roof.
Outside · Right Now
Partly cloudy
88°F· feels 92°
SW 8 mph·54% RH·UV 9 (very high)
Tonight 73°  /  Tomorrow 91°, 40% chance afternoon storms.
Cooling load expected to peak 4.2 kW between 3–6 PM.
Source · National Weather Service
Air · PM2.5
Clear · ERV nominal
8µg/m³
Outdoor
2µg/m³
Indoor
The home is 4× cleaner than the air at the curb. When PM2.5 outside climbs above 35 µg/m³ — wildfire smoke, cedar season — your ERV throttles to filter-priority mode automatically.
Source · PurpleAir · in-home monitor
ERCOT · Texas Grid
Normal operations
Frequency
60.00 Hz
Reserve margin
7,420 MW
Forecast peak today 68.2 GW. If ERCOT calls a conservation appeal or EEA, you'll see it here — and your home will already be running from Powerwall + solar.
Source · ERCOT public feed
Solar · Right Now
Net export
8.2kW
18.4 kWh today·yesterday 67.8·lifetime 22,400.
The dashed line is now (1:42 PM). South array peaks at ~2 PM.
Source · Enphase IQ8M
Battery · Powerwall ×2
Charged
96%· 25.9 kWh
Home is currently powered by solar with 3.0 kW exported to the grid.
Autonomy at tonight's load: ~18 hours off solar+battery alone.
Source · Tesla Fleet (mock · partner access required)
Top Circuits · Last Hour
Total home · 5.2 kW
i
Heat pump · Zone 1 (great room + primary)
2.8 kW
ii
Pool pump · variable speed (low cycle)
1.1 kW
iii
Dryer · main laundry
0.6 kW
iv
Kitchen plugs + induction range
0.4 kW
v
Heat pump · Zone 2 (guest suite + pavilion)
0.3 kW
Solar producing 8.2 kW, home using 5.2 kW, surplus 3.0 kW to the grid via DTE.
Source · SPAN smart panel (mock · partner access required)
Drought · Travis County
D1 · Moderate
23days
Since the last measurable rain — 0.9" on April 28.
YTD rainfall 9.2"  /  historical avg 12.8".
Cistern 3,200 / 5,000 gal  ·  last fill captured ~720 gal.
Source · USDM · NOAA CDO
Today's Rhythms
Long day
Sunrise 6:32 AM
Sunset 8:14 PM
Solar noon 1:23 PM
UV index 9 (very high) — peaks 12–3 PM.
Moon: waxing gibbous, 64% illuminated.
Source · Computed · NWS UV
Pool · Pavilion side
Pump · low cycle
81°F
Solar boost adds +3°F by sundown today.
Variable-speed pump on quiet cycle 6 AM – 10 PM; chemistry within range.
Source · Pentair (mock · partner access required)
This Month

May, in numbers

Energy Performance · Trailing 30 Days
Top 4% in Travis County
+118%
net produced
You generated 1,604 kWh and used 1,360 kWh. The surplus is credited back to the grid through DTE. Cooling-season margin will tighten in July and August — the model still holds.
average Austin home
Indoor Air
Excellent
540 ppm CO₂
PM2.5 avg 2 µg/m³ · Humidity 49%
Indoor Climate
Stable
73.0°F
Variation across the home: ±0.9°F
Water · Cistern
64% full
3,200 gal
Last rain April 28 · 0.9"
Recent Activity

What's happened

May 21
§
Cistern pump cycled twice last night. Pressure dropped 6 PSI between cycles — usually the float switch. Driscoll & Sons can come Friday.
Handle
May 18
Zehnder ERV — spring service complete. Performed by Cole Mechanical. Recovery efficiency holding at 81%.
Report
May 12
I
Live oak — annual inspection logged. Bradley Tree Care. No structural concerns; small deadwood pruned. Next visit fall 2026.
Notes
May 04
II
Native plant border — 6-month walk. Hill Country Native. Two muhly grass clumps relocated to the creek edge; salvia thriving.
Photos
Apr 28
Captured 720 gallons from a 0.9" rain event. Cistern brought from 47% to 64%.
Detail
Apr 14
Two-year systems review from Cardinal & Co. All systems performing within or above design spec; a few notes on the outdoor cabinetry oiling cadence.
Open
Place

The land before, the house now

A quarter-acre on the Edwards Plateau — limestone uplift, scrubland, Tonkawa country, Spanish grant, ranchland, a small ranch house, and now this one. Here is what the home remembers.

This quarter-acre has been many things — limestone uplift, scrubland, ranchland, a small 1963 ranch house, and now this one. The Lueders stone at the entry is older than any human language ever spoken on top of it; the live oak in the courtyard is older than the State of Texas; the previous house here was older than either of us. What follows is what we know of the place — for our own reference, and the next family's.

Deep Time

A quarter-acre, across the long view

~110 million years ago
A shallow sea lays down the limestone
Cretaceous sediment forms the Edwards Aquifer formation underneath the entire Hill Country. Our entry stone, quarried in Lueders 250 miles north, is from the same body of rock that this house's foundation sits on.
~10,000 BCE
First peoples in central Texas
Paleo-Indian groups follow the Colorado River drainage. Archaeological evidence concentrates along the springs at what is now Barton Springs, a short walk downhill from this lot.
1500s — 1800s
Tonkawa, Lipan Apache, and Comanche presence
The Tonkawa were the longest-established people in the immediate Colorado River valley; Lipan Apache and Comanche bands moved through the region throughout the period.
1822
Stephen F. Austin's "Little Colony"
The Mexican Republic grants Stephen F. Austin permission to settle 300 families along the Colorado. This lot sits within the original "Little Colony" boundary, though it remained unsettled rangeland for another century.
1880s — 1950s
Cattle & sheep ranchland
For seven decades this hillside was part of a larger ranch — mostly cattle, occasional sheep. The 1949 drought is the period of greatest hardship in the local oral history; ranchers culled herds by half. The live oak in our courtyard would have been around 90 years old, and already shading whatever cattle huddled beneath it.
1955
Rollingwood is incorporated
A small residential community on the bluff above the Colorado, four miles west of the Texas State Capitol. Population today: roughly 1,500 across about 500 lots. Among the earliest planned residential enclaves of postwar Austin.
1963
The previous house
A three-bedroom ranch on a concrete pier foundation. 1,920 sf. The Holsclaws bought it in 2009 and raised two children here. The structure was deconstructed in 2023; the cedar from its rafters is now inside our pavilion ceiling.
2023 — 2024
Wickham Studio designs the new house around the live oak
The courtyard footprint was set by the drip line of the existing oak. Foundation, pavilion, and pool were all designed afterward, in deference. Construction completed February 2024.
2026 — Year Two
Where we are now
Caroline & James in residence. Two summers in, the systems are settled. The oak is unchanged.
The Live Oak

A witness at the center of the house

167± 23 years
Estimated by core sample · Bradley Tree Care · Sep 2023
Older than the State of Texas. The oldest growth in this tree began as an acorn somewhere in the early 1860s, while the land was still ranch. It has stood through the 1925 ice storm, the 1949 drought, the 2011 drought, the 2021 winter event, and a thousand summers that came and went without incident.
Species
Quercus fusiformis
Drip-line canopy
47 ft diameter
Trunk DBH
42 in
Witnessed
Texas statehood
When the house was being framed, Henry Cardinal kept the no-disturb tape up for the entire build — fourteen months. The site supervisor told the trades that anyone who put a tool in the root zone would be sent home for the day. No one ever was. The oak doesn't seem to know the house is here.
Coring report · arborist file · 9 pp
Provenance

Where the materials came from

Stone · Entry & chimney
Lueders limestone
Lueders, TX Jones County · 240 mi NW
From the same Cretaceous formation that lies beneath this house. Quarried by hand-guided machine and cut by Hartman Stone — three generations in Bryan, Texas. Used inside the Texas State Capitol, the LBJ Library, and in dozens of Hill Country buildings since the 1880s. Honed face.
Mason · Hartman Stone Finish · Honed
Wood · Siding
White oak rainscreen
Concan, TX Uvalde County · 180 mi SW
Milled by Frio Lumber Co. in Concan — a small Hill Country operation that has been in the same family since the 1940s. The boards on your south elevation were standing trees there in late 2023, roughly 84 years old. The shou sugi ban panels at the chimney were charred by Cardinal carpenters one afternoon in February 2024; those photographs are in Construction Memory.
Mill · Frio Lumber Co. Finish · Penofin penetrating
Wood · Form-boards
Ashe juniper formwork
Hill Country, TX Cleared rangeland · 35 mi W
The 2×6 rough-sawn boards that left their grain in the concrete plinth came from Ashe juniper cleared off a ranch west of Dripping Springs. The trees were already on the ground when Cardinal called the mill. The pattern they left in the plinth is permanent.
Source · Reclamation Status · One-time use
Wood · Floor
Reclaimed heart pine
Galveston, TX Warehouse demo · 230 mi SE
Floors throughout the main level are reclaimed heart pine from a 1908 cotton warehouse on the Galveston wharf, demolished in 2021. Pre-hurricane Texas longleaf, denser and more dimensionally stable than any pine you can buy today. The lumber was already over a century old before it became our floor.
Reclaimer · Lone Star Salvage Age at install · 116 yr
Metal · Roof
Standing-seam steel
Adel, GA McElroy Metal · 920 mi E
24-gauge steel, dark bronze powder-coat finish. The finish was specified to age slowly and read as patinated copper from middle distance — a Hill Country roof shouldn't look new.
Manufacturer · McElroy Metal Warranty · 40 yr finish
Glass · Windows
Marvin Modern fenestration
Warroad, MN Marvin · 1,520 mi N
Blackened aluminum-clad fiberglass frames, triple-glazed with argon fill. Overspecified for Texas thermal performance, deliberately — the triple-pane glass doubles as sound insulation for the distant flight path overhead. Marvin's Warroad plant is family-owned in its fifth generation.
U-value · 0.22 Units · 31
Watershed

Every drop, where it came from and goes

All water on this land flows southeast — across the back slope, into the small creek behind the house, into Barton Creek, into Lady Bird Lake, into the Colorado, and eventually to the Gulf of Mexico. The cistern holds the rain briefly and returns it to the irrigation lines and the toilets. The greywater system routes shower and laundry water out to the rain garden.

Edwards Aquifer Barton Springs Lady Bird Lake Colorado River Gulf of Mexico
Annual capture · target
28,000gal · cistern
Greywater · target
12,000gal · back to land
Native plant species in border
22varieties
For the Next Owner

This page is meant to be passed down. If you are the next family to live in this house, hello. The live oak will be older when you arrive, but probably not by much. The limestone will look the same. The cistern asks for almost nothing, and gives back the irrigation budget every spring. The house was built to be in good shape well into the 22nd century, if you'll let it be. Treat the oak gently.

Caroline & James  ·  Rollingwood, Texas  ·  2026
Systems & Materials

Every part of the house

Seventeen named systems, every spec, every model number, every warranty — held in one place for the life of the home.
Mechanical · HVAC
Mitsubishi VRF Heat Pump
Cooling now
PURY-HP60 · 5-ton multi-zone, six indoor heads · Installed Feb 2024
SEER2
21.4
Refrigerant
R-410A · 7.2 lb
Warranty
12y compressor
Installer
Cole Mechanical
Mechanical · Dehumidification
Aprilaire E100 Dehumidifier
Sized for hot · humid
Whole-home, ducted to the return plenum · 100 pints/day
Target RH
48–52%
Duct integration
Return-side
Warranty
5y · 3y left
Installer
Cole Mechanical
Mechanical · Ventilation
Zehnder ComfoAir 350
81% recovery
Energy recovery ventilator · sized for 4,800 sf · climate 2A
Filter
F7 / G4
Wildfire mode
Auto · PM2.5 35+
Warranty
10y · 8y left
Installer
Cole Mechanical
Electrical · Generation
Enphase Solar Array
8.2 kW now
IQ8M microinverters · 32 panels · 12.8 kW · roof + carport canopy
Tilt
South · 22°
Lifetime
22,400 kWh
Warranty
25y panel + inv.
Net meter
Austin Energy
Electrical · Storage
Tesla Powerwall 3 · ×2
96% · 25.9 kWh
Two Powerwall 3 units, AC-coupled · 27 kWh total · 11.5 kW continuous
Total capacity
27.0 kWh
Backup mode
Whole-home
Warranty
10y · 8y left
Installer
Brightline Electric
Electrical · Distribution
SPAN Smart Panel
400A main
SPAN Panel 2 · 32-circuit smart panel with per-circuit metering
Total circuits
32
EV charger
Wallbox 240V
Warranty
10y · 8y left
Installer
Brightline Electric
Envelope · Glazing
Marvin Modern Windows
U-0.22
Blackened aluminum-clad fiberglass · 31 units · including 4 large fixed panes
Glass
Low-E · Argon
SHGC
0.31 (south)
Warranty
20y · 18y left
Finish
Coal black ext.
Envelope · Cladding
White Oak Rainscreen
Re-oil 2027
Vertical white oak siding · select shou sugi ban panels at south chimney mass
Profile
1×4 v-groove
Finish
Penofin penetrating
Cycle
3 years
Source mill
Frio Lumber Co.
Envelope · Stone
Lueders Limestone Cladding
Local · cool-load
Quarried in Lueders, Texas · entry mass + chimney face · honed
Color
Cream · golden
Pattern
Ashlar · sawn
Sealer
Breathable
Mason
Hartman Stone
Water · Harvesting
Rainwater Cistern
64% · 3,200 gal
Below-grade concrete cistern · 5,000 gal · serves irrigation + toilets
Filtration
5 µm · UV
Pump
Grundfos SCALA2
Capture YTD
6,820 gal
Installer
Driscoll & Sons
Outdoor · Pavilion
Screened Pavilion
Dark-sky lit
700 sf screened pavilion · outdoor kitchen · Lueders limestone floor
Screen
No-See-Um mesh
Grill
Hestan · 36"
Re-screen
~10 yr cycle
Lighting
Lutron · Ketra
Outdoor · Pool
Lap Pool · Solar-Assist
81°F · clear
Pentair IntelliFlo3 variable-speed pump · roof-coil solar boost
Length
42 ft lap
Volume
18,400 gal
Warranty
Equipment 5y
Service
Aqua Cult monthly
Construction Memory

How the house came to be

Two-hundred-and-eighty-four photographs across fourteen build milestones. Every interior wall photographed before drywall — kept forever, for the next time you want to open something up.
The live oak at the center of the courtyard was the design's first decision. Everything — the foundation outline, the pavilion line, the orientation of the pool — bent around its drip line. The arborist's report from the first site visit is the first document in this section.
Sep 11, 2023 — Site visit
The live oak gets a number

Bradley Tree Care surveyed the lot before clearing. The 24-inch live oak at the south corner was tagged, root zone marked at 24 ft, and a no-disturb perimeter laid out in survey tape. Cardinal & Co. designed the courtyard outline around it.

Nov 02, 2023 — Foundation
Board-formed concrete plinth

2×6 rough-sawn cedar boards formed the visible concrete plinth at the entry and pool surround. The texture is permanent — what you see is what came out of the forms. Hydronic loops were placed in the slab before the pour.

Jan 24, 2024 — Wall assembly
Walls open · what's behind your drywall

The reference set. Every interior wall photographed from both sides before insulation and drywall — tagged with stud locations, plumbing runs, electrical chases, structural points, and the cedar blocking placed for future art and sconces. Years from now, when you want to hang a heavy mirror in the primary bath, this is where you look first.

Open the wall map →
Feb 09, 2024 — Envelope
White oak rainscreen, board by board

The vertical oak siding was installed with a 5/8" rainscreen gap, hand-fastened from a Frio Lumber Co. delivery. The chimney mass shou sugi ban panels were charred by hand by the carpenters on a Friday afternoon — the photos here are from that day.

Feb 22, 2024 — Blower door
Air-tightness test passed

Result: 0.71 ACH₅₀ — strong for a Texas climate where building so tightly is rare. The dehumidifier was specified specifically because the home is built this airtight.

Mar 04, 2024 — Handover
Keys and a Hill Country breakfast

The walkthrough was logged in 52 stops across both floors and the pavilion. Every system was demonstrated, every Lutron scene set, every shut-off valve toured. The closing gift was a basket from a Mason farm stand and a hand-drawn map of the property by Wickham Studio.

Care & Maintenance

Quiet, on a schedule

Fourteen recurring tasks across the home, the land, and the systems. Each one with the right cadence, the right person, and the right reminder.
1
Action this week
4
Coming this season
14
On the year ahead

Upcoming

Fri · May 24
Cistern float-switch service Two-cycle event detected May 21 — Driscoll & Sons on site Friday morning
As-needed
In 2 wks
HVAC filter change MERV 13 · 20×25 · three returns
Every 90 d
June
Live oak summer inspection Bradley Tree Care — pre-summer hydration check + canopy thin
Semi-annual
June
Pavilion screen — pre-mosquito walk Visual inspection of all screen panels and bug-strip seals
Annual
July
Pool acid wash + chemistry deep dive Aqua Cult — quarterly deep service
Quarterly
August
White oak rainscreen — annual look Photograph all four elevations; flag any sun-blanching for the 2027 re-oil
Annual
October
Heat pump pre-cool-season check Cole Mechanical — refrigerant pressures, coil clean, drain pan
Annual
November
Native plant border — winter prep Hill Country Native — cut back, mulch, mark fall plantings
Semi-annual
Documents & Warranties

Where the paper lives

Thirty-one documents, indexed and searchable. Every drawing, certificate, warranty, and handbook the home will ever need.
Build · As-Built
As-built architectural set
Final drawings reflecting actual construction. Includes structural and mechanical revisions logged during the build.
PDF · 78 pp Open →
Build · Air Tightness
§
Blower-door & commissioning report
0.71 ACH₅₀, energy model, and final commissioning of HVAC + ERV + dehumidifier.
PDF · 22 pp Open →
Property · Title
Survey, deed, creek easement
Includes the recorded utility easement at the front and the creek access easement at the rear lot line.
PDF · 14 pp Open →
Owner · Reference
The Rollingwood handbook
A custom-written manual for this home, written by Cardinal & Co. and Wickham Studio — specific to this build.
PDF · 96 pp Open →
Equipment · Manuals
Equipment library
Every appliance, fixture, and piece of equipment in the home, with model number, finish/SKU, and PDF manual.
48 items Browse →
Finish · Reference
Paint, stain & stone schedule
Every color, finish, and material in the home — keyed to room, surface, and source. Penofin tone, Lueders color match, Hartman mortar mix.
PDF · 12 pp Open →
Property · Live Oak
Arborist report — site survey
Bradley Tree Care's pre-construction survey of the courtyard live oak: drip line, root zone, no-disturb perimeter, ten-year health plan.
PDF · 9 pp Open →
Utility · Net Meter
Austin Energy interconnect agreement
Net metering agreement for the 12.8 kW array, current credit balance, and ERCOT settlement notes.
PDF · 6 pp Open →
Water · Well
Well log & water quality panel
425 ft deep · Edwards Aquifer. Initial water quality panel and the annual nitrate/coliform retest record.
PDF · 8 pp Open →
Active Warranties

What's still covered

Item
Coverage
Time remaining
Roof — Standing seam steel
Dark bronze finish · 24-gauge
40 yr finish · lifetime structural
38 YR LEFT
Solar array
Enphase IQ8M · 32 panels
25 yr panel · 25 yr inverter
23 YR LEFT
Powerwall ×2
Tesla · 10 yr full
10 yr capacity + cycles
8 YR LEFT
ERV · Zehnder
ComfoAir 350
10 yr full system
8 YR LEFT
Heat pump · Mitsubishi VRF
PURY-HP60
12 yr compressor · 7 yr parts
10 YR LEFT
Windows · Marvin Modern
31 units
20 yr seal · 10 yr hardware
18 YR LEFT
Cardinal builder structural
Cardinal & Co.
10 yr full structural
8 YR LEFT
People

Everyone who built & cares for your home

Twelve people on this home today — the builder, the architect, the trades who know what's behind every wall.
C
Builder · Primary
Henry Cardinal
Cardinal & Co. · Austin, TX
Henry led the Rollingwood build and is the first call for anything material, structural, or persistent. He has worked with Wickham Studio on every Cardinal project since 2019.
W
Architect
Wickham Studio
Austin, TX · Practice of 8
Designed the house around the courtyard live oak. Holds the as-built set and is on retainer for any future addition, kitchen, or pavilion work.
C
Mechanical · HVAC + ERV
Cole Mechanical
Pflugerville, TX · 16 mi
Installed and services the Mitsubishi VRF heat pump, the Aprilaire dehumidifier, and the Zehnder ERV. Service plan active through Feb 2027.
B
Electrical · Solar & Service
Brightline Electric
Round Rock, TX · 18 mi
Wired the entire home, installed the SPAN panel, the Powerwall pair, and the Enphase array. Keeps records of every circuit run in the house.
A
Pool & Cistern
Aqua Cult
Austin, TX · 9 mi
Monthly pool service, quarterly deep service. Holds the chemistry log going back to commissioning. Also services the Grundfos cistern pump.
H
Landscape · Native
Hill Country Native
Dripping Springs, TX · 22 mi
Designed the muhly + salvia + agarita border and the meadow. Knows which oaks were preserved and why. Biweekly summer rotation.
B
Arborist · Live Oak
Bradley Tree Care
Westlake Hills, TX · 4 mi
Tagged the live oak before the slab was poured. Twice-yearly canopy walk, structural assessment, drip-line management.
+
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The Rollingwood House · Year Two A Cardinal & Co. project