Troubleshooting

My areas look wrong

Almost always a scale problem. Open the plan and check the scale chip: if it is amber ("Scale inherited from plan - re-calibrate for accurate areas"), the scale was carried over from another page. Re-calibrate against a known dimension on the page you are measuring. For a stretched or squashed PDF, use two-axis (H×V) calibration. See Uploading and calibrating your plan.

A roof area seems too small

Set the roof pitch. A flat default measures the plan footprint; a pitched roof's real (sloped) area is larger. The label shows both, for example "45.50 m² ∠30° (plan 39.40 m²)".

An element shows no R-value, or the result is incomplete

Every element needs a complete assembly. A layer missing its product or R-value leaves the element's R undefined and the total blank. Assign a sample assembly to get moving, then complete the layers. See Assemblies and products.

I get a warning that my wall is below 38% framing

H1/AS1 6th edition assumes at least 38% wall framing unless a lower fraction is demonstrated for the building. Use the H1/AS1 min (38%) button, or the framing-fraction calculator, and keep the demonstration with the project if you use a lower value.

The report flags my skylight or supplied floor R as unverified

Those values have no automatic backstop, so Thermly asks you to confirm them. For a skylight, record the U-value basis (R = 1/U_w). For a supplied floor, enter the manufacturer and source document. The value is used as entered; the flag is a prompt to confirm it. See Supplied floors and rafts.

My glazing fails the cap

The Calculation Method applies only while wall glazing is 40% or less of the gross wall area (§2.1.2.5). Above it, H1 requires the Modelling Method (H1/VM1). Reduce glazing to bring it under the cap, or switch to the modelling pathway.

I cannot save, or the project is read-only

An Approved project is final and locked - make a copy to revise it. On a shared project, an organisation admin can also lock a project, or a colleague may hold the editing lease ("Being edited by …"); wait for it to free up or ask an admin.

The plan will not open, or a download link fails

Plan links are time-limited for security and expire after about five minutes. Re-open the plan (or reload the project) to get a fresh link. If a plan still will not open, try Replace to re-attach it.

A product is missing, or its R-value looks wrong

Use Custom R-value on the layer and enter the figure from the manufacturer's current datasheet with its basis. Check Show source to see what the catalogue value rests on, and send product feedback from the app. See Product sourcing and provenance.

Still stuck?

Use the in-app Feedback link. Include the project name and what you expected versus what you saw.