New Window opening. Best way to bridge reveal

[and1c]

ok guys.

I am in the process of installing a small double glazed unit in a new ensuite in an existing bedroom.
It didnt require planning permission (I did ask our local planning dept). The window install will be inspected and 'signed off' by my friend who is Fensa registered and runs a glazing company....(I have fitted a number of windows for his company in the past so he trusts that I will make a decent job of it )

Its a small opening approx 850mm high by 450mm wide.

I have cut the opening and installed a catnic (sp?) lintel as per the Building Inspectors instructions.

We are now in the final stages of the ensuite though and the window is in place but the reveal is still bare.

The window is in the outer skin of bricks (no surprise!) and of course there is then the cavity (not insulated), and then the hole in the blockwork on the inside of the house.

Whats the best way to board this out so that the tiler can tile the bathroom as planned and I end up with a nice dry reveal? (he is tiling it)

I want to avoid damp issues and there is enough space left with the window installed, to bridge the reveal with moisture boards (moisture resistant plaster boards) and they will rest on the edge of the inner edge of the outer skin of bricks (basically right up to the window).

Ive only replaced existing windows in the past so Im not sure of the correct practice for a new reveal? Ive found some cavity 'boards' that sort of do what I want but the website they were on is in the US!

All advice appreciated.
Thanks

 

[Richard C]

Rather than prat about with a DPC, I use plastic cavity closers on the side & bottom reveals; if the window has been installed correctly, you should have a minimal gap between the closer & the inner face of the frame. Closers are more expensive but are easy to use & avoid any possibility of bridging the cavity. I then line the reveal with plasterboard & skim to finish. Doesn’t matter (as such) if the cavity is not insulated but if it isn’t, I usually double up on the plasterboard. I always use white Polyboard for the sills & stick it on with a trade grab adhesive; again, it’s more expensive but it’s laminated, looks great, is easy to clean & you don’t have to paint it.

 

[and1c]

Rather than prat about with a DPC, I use plastic cavity closers on the side & bottom reveals; if the window has been installed correctly, you should have a minimal gap between the closer & the inner face of the frame. Closers are more expensive but are easy to use & avoid any possibility of bridging the cavity. I then line the reveal with plasterboard & skim to finish. Doesn’t matter (as such) if the cavity is not insulated but if it isn’t, I usually double up on the plasterboard. I always use white Polyboard for the sills & stick it on with a trade grab adhesive; again, it’s more expensive but it’s laminated, looks great, is easy to clean & you don’t have to paint it.

Thanks Richard
I asked for some 100mm cavity closers at my local builders merchants...and they worked a charm

Really pleased with that discovery so thanks again..
Ive done as you said, used the cavity closers on side and bottom reveals and then boarded it all out using moisture board.
The whole reveal is being tiled so the moistureboard was the easiest option!

 

[Richard C]

Rather than prat about with a DPC, I use plastic cavity closers on the side & bottom reveals; if the window has been installed correctly, you should have a minimal gap between the closer & the inner face of the frame. Closers are more expensive but are easy to use & avoid any possibility of bridging the cavity. I then line the reveal with plasterboard & skim to finish. Doesn’t matter (as such) if the cavity is not insulated but if it isn’t, I usually double up on the plasterboard. I always use white Polyboard for the sills & stick it on with a trade grab adhesive; again, it’s more expensive but it’s laminated, looks great, is easy to clean & you don’t have to paint it.

Thanks Richard
I asked for some 100mm cavity closers at my local builders merchants...and they worked a charm
Really pleased with that discovery so thanks again..
Ive done as you said, used the cavity closers on side and bottom reveals and then boarded it all out using moisture board.
The whole reveal is being tiled so the moistureboard was the easiest option!

Nice one