Detailer
Build a wall, roof or floor the way it's actually made — layer by layer, exterior to interior finish — and let the drawing carry the data that guides iteration. The hatched section (drawn flat for roofs and floors) redraws live over aligned temperature and vapor-pressure charts: a dew-point (Glaser) pass names the plane where winter condensation would land, effective R/U uses the kind-correct ASHRAE films (heat flowing up, down and sideways differ) and includes what the studs really cost, and weight, installed cost and embodied carbon — pinned to the platform's shared ICE factors — read out beside them. Thirteen presets each teach a lesson (vented attic vs compact roof, the sweating slab); a thermal-bridge gallery covers what a 1-D stack can't see. Send the solved assembly to Assayer and the massing's energy balance and wall/roof carbon read YOUR construction instead of the fixed stand-in. Client-side.
The default American wall: batts between studs. Watch the framing shave the nominal R, and the OSB run cold in winter.
Run the dew-point check at a cold-month MEAN, not just the design low — steady-state analysis at the extreme overstates a wall that can store and dry.
Exterior layer first (left in the drawing).
| # | Layer | in | R | perm |
|---|---|---|---|---|
| 1 | Fiber-cement siding | 0.31 | 0.2 | cl III |
| 2 | Housewrap WRB | 0.02 | 0 | open |
| 3 | OSB sheathing | 0.44 | 0.5 | cl III |
| 4 | Fiberglass battwood @16″ | 5.5 | 20.4 | open |
| 5 | Kraft facing (on batt) | 0.02 | 0 | cl II |
| 6 | Gypsum board | 0.5 | 0.5 | open |
This solver is 1-D — it can't see the junctions where assemblies meet. Thermal bridges — the gallery →
Condensation predicted at OSB sheathing · Fiberglass batt — 12 °F with vapor pressure 0.48 kPa over a 0.27 kPa saturation limit.
Glaser method: steady state, no rain wetting, no storage, no air leakage — a screening tool that finds the risky plane, not a hygrothermal simulation.
Carbon factors: 3 of 6 layers pinned to the platform's shared ICE v4.0 table (the same numbers Footprinter and Assayer use). ≈ Wider band — study values, no repo factor: Fiber-cement siding, Housewrap WRB, Kraft facing (on batt).
Study values for comparing iterations — handbook R and perm ratings, rough 2025 US installed costs. Not for bidding, compliance, or an LCA.
Assayer’s energy balance and embodied-carbon read assume one fixed construction. Sync → Test the wall in Assayer (top of the page) sends the solved wall — effective U 0.062 (0.35 W/m²K) with framing + films, carbon 2 kgCO₂e/sf — so the massing is judged in the assembly you actually drew. Send the wall, switch Kind, send the roof and floor — the slots travel together. Glazing and the slab’s per-volume carbon keep Assayer’s fixed build-ups.
Save the wall as you iterate — each row keeps its own layers and conditions, and the table lets the versions argue: R against thickness against cost against carbon.
Reads the file Export → Wall JSON writes. To keep a wall inside the site instead, use Save — same layers, no download.