Building A New House
Dec 01, 2019 8:22 pm
Building a house at the moment and finishing off external finish.
We have brick render downstairs and hebel render upstairs, all aluminium windows/doors.
Asking my builder about external sealing/caulking of the joins between black aluminium frames and render.
Pic attached.(black protective tape is covering the windows and the frame)
They said they don't caulk the edges, as cracking render is not as issue ( render is more 'flexible' these days), and also give clean lines. The render goes right to the edge of the aluminium and has formed a seal.
My friend who is building, they have caulked all around the edges of their home (albeit with a color that is close to render or frame, but not perfect) and the builder does this with a flexible sealant.
A search on the web says caulking should be done (both by hebel company, and companies that make render)
However, another builder says they dont caulk.
What would be recommended good practice?
Re: External caulking of window frames and render edges?2
Dec 02, 2019 9:37 pm
To comply with non-cavity construction the Hebel Powerpanel needs to be caulked and painted.
You can caulk before painting and that is best option. So render, caulk then paint. Or render, paint then caulk with suitable colour.
The coating you have is still porous and the neat finish along your window edge will not last. Coloured trowel on texture (no paint on top) is not covered by any warranty with the main render suppliers.
Use a polyurethane sealant not silicone or acrylic. It’s not easy caulking between render and window frame.
Prudent building surveyors are making sure this done.
Re: External caulking of window frames and render edges?3
Dec 03, 2019 9:45 am
After a burglary a new window was put in. Installer used silicon, sprayed it with some liquid and used fingers to smooth it. Mind you, in my case it is brick to aluminium, not render to aluminium.
Original builder did not use silicon with the result the internal wooden window sill now has water marks from window washing! Render being more flexible? It is still cement based and will crack. Sounds to me like an excuse.
Re: External caulking of window frames and render edges?4
Dec 05, 2019 9:39 am
Thank you so much for your help. It does make sense to seal gaps between two structures that can have some independent movement between them, and can totally understand that edge of render without sealing would crack.
I will discuss with builder and thanks
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