double-glazing.........

Gill Smith ( snipped-for-privacy@googlemail.com) wibbled on Wednesday 02 February

I had that problem - wasn't much of a problem though, for me. I was able to have the window frame (uPVC) bridge the cavity DPM and filled the space with foam - and still get the window where I wanted it.

Is that what you meant?

indeed

aligning frame + cavity + damp course, then securing/filling

- the existing installation has damp patches on vertical walls

because the window frame doesn't bridge the cavity

and the vertical damp course was *plastered* to the exterior wall

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i.e. down the sides of the window

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Gill Smith ( snipped-for-privacy@googlemail.com) wibbled on Wednesday 02 February

If you are fitting uPVC, try to span the cavity gap - it's less critical exactly how you span it as the frame is both damp proof and a reasonable heat insulator.

If you were fitting wooden frames, might be trickier - but if you leave a

Mind you, though Barrat may rely on foaming for fixing, I still use a few big-assed screws! But foam does help - it's amazing how much a frame that won't fall out, but is still a bit wibbly becomes absolutely solid after the foam sets.

HTH

Tim

You usually dont need to span the cavity gap totally. Just make sure the uPVC frame goes some way across the cavity. Close the cavity with an insulated cavity closer (usually has integral vertical DPM although not strictly needed with a plastic window frame), or expanding foam maybe. The uPVC frame separates the plaster / plasterboard from the outside skin as long as it crosses the cavity to some extent. Simon.

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sm_jamieson (sm snipped-for-privacy@hotmail.com) wibbled on Wednesday 02 February 2011

Interesting. I didn't have a closer as the 1950's house had the cavity mostly closed by a turned in leaf - 1/2" gap with a bit of DPM shoved in.

harry ( snipped-for-privacy@aol.com) wibbled on Thursday 03 February 2011 08:47:

Those retro fit OK...

I thought you'd be younger ;-)

just whacked off more plaster work

the house was built with a brick return

phew!

it's a good house (mostly) that's been abominably treated

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Like mine, I see your DPC was cut with v. little overlap protruding from the brickwork

p.s. was that fibreglass packed between the hanging DPC and exterior wall?

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I meant in this pic

geraldthehamster ( snipped-for-privacy@hotmail.co.uk) wibbled on Thursday 03 February

I was 20 years younger 7 years ago, then I had kids. well, SWMBO did, but the blast radius is quite wide(!)

Gill Smith ( snipped-for-privacy@googlemail.com) wibbled on Thursday 03 February

Probably some blown fibre cavity fill escaping...

I did pack a few small voids with glass wool where I had to make good old vent holes, because it was to hand...

Gill Smith ( snipped-for-privacy@googlemail.com) wibbled on Thursday 03 February

brackets, so I didn;t have to make a mess after we moved in.

Then last winter (2009) was cold so I saled the old window frame in with foam. Good move...

though it was also cheaper, a strip of 6in plastic with a strip of polystyrene the width of the cavity and about an inch deep attached to it. You can see the edge of the plastic is this: