UPVC cladding around internal windows

foreversummer

Hi

My house has upvc windows and I have a problem whereby I get mould around the tops and sides of the frame where the frame meets the wall. I've tried resealing them but to no avail long-term.

I've noticed in other folks houses that they have UPVC several inches around the frames top and bottom in the window recesses. Does anyone have any idea what I'm on about? It's really difficult to explain.

Is it possible to buy upvc cladding to abutt the frames internally and does anyone think this would solve the problem.

foreversummer

jenny-wren

I think that the uPVC trim that is installed around windows is simply to hide any gaps where the window meets the wall. We've specified that we don't want the trims when we get our double glazing re-done but the installer says he may be limited depending on what he finds underneath when he removes the old trim.

If you have mould growing around the window it's likely to appear on any trim that you install (as has happened in our neighbour's house).

Furts

The mould is likely to be a result of poor installation of the windows. There should be a seal on the outside face to stop cold coming in, and also on the inside face to stop heat leaking out. Typically a silicone bead. or siliconed on trims.

The gap between the window and wall should also be sealed - think typically expanding foam.

If you have cavity walls it is likely the cavity closing detail is defective or non existant. You will not see this because the frame is obscurring it.

Above your window the lintel could be causing a cold bridge. It might be possible to expanding foam the lintel if it is a steel box section Catnic/IG type lintel.

TheCyclingProgrammer

jenny-wren wrote: »

I think that the uPVC trim that is installed around windows is simply to hide any gaps where the window meets the wall. We've specified that we don't want the trims when we get our double glazing re-done but the installer says he may be limited depending on what he finds underneath when he removes the old trim.

If you have mould growing around the window it's likely to appear on any trim that you install (as has happened in our neighbour's house).

Unfortunately you'll probably find that when the windows are fitted the PVC profile will be necessary to cover up any minor damage to the plaster or cover up any gaps.

You could have the reveals replastered up to the frames and have a thin bead of caulk but if there's even a tiny bit of movement you may find the caulk cracks.

Furts

jenny-wren wrote: »

We've specified that we don't want the trims when we get our double glazing re-done but the installer says he may be limited depending on what he finds underneath when he removes the old trim.

Full marks to you for stating this requirement and it is an ongoing shame that more consumers do not adopt this approach.

All to often trims are applied to hide the gaps and general bodgery undertaken by window installers.

In common with your approach, none of my pvcu windows have any trims on the inside. All are fully sealed in place and then plastered to give a good finish.