Component A
Component A for the frame line, with a sealed vapour path on the warm side and a drained path on the cold side.
See specificationSunrooms
Sunrooms that stay usable in the afternoon
Glass roofs heat up faster than walls and condense faster than either. The frame line is where both problems are solved.
What goes wrong on site
Three failures, in the order they appear
- 01
The roof bakes by 3 p.m. and the room becomes unusable.
- 02
Condensation runs down the frame and stains the reveal.
- 03
Air-conditioning load doubles because the envelope leaks.
Why one-component foam, and not something else
Three properties, no chemistry
- Mobility: a can and a gun reach a joint that a panel, a board or a truck cannot.
- Irregular geometry: it expands to the shape of the void, including penetrations.
- Closed cell: air barrier and moisture barrier in one pass, without a second trade.
How it is done, and what to hold
The four numbers this job lives on
| Step | What to hold |
|---|---|
| Surface | Frame dry and clean, thermal break in place, glass masked before foaming. |
| Fill volume | One third of the joint depth. The foam expands to fill; filling it to the top bends frames and wastes material. |
| Passes | Two passes of 30 mm at most. A single thick pass traps heat and collapses in the core. |
| Trim | Cut after the window on the parameter card. Never pull or press uncured foam. |
| Cover | PU is not UV-stable. Any exposed face gets sealant, render or a trim within 48 hours. |
Typical guidance. The parameter card for your grade carries the tolerances your operators work to.
Common failures
Three ways this job goes wrong
- Foaming into the glazing rebate, then discovering the bead cannot be replaced.
- Leaving the foam as the visible finish at the frame line.
- Sealing both faces of the cavity so condensation has nowhere to go.
What to tell your customer
Three sentences you can copy into a quotation, a WhatsApp message or a site meeting. Your competitors' websites talk about themselves; this block is for you to talk about the job.
„We cut the heat before it enters, instead of cooling it after.“
„The frame line is sealed and drained — condensation has a path out.“
„The foam is covered, so you see the frame, not the foam.“
Send the drawing or the photo — we will reply with the parameters.
Technology brand
Tell us the joint, the substrate and the season
- 1 tonne minimum, five 200 L drums
- SDS, COA and Form E with every shipment
- We reply within 24 hours, Monday to Saturday.