Windows in unplastered walls

[MortarThePoint]

In the house I've fixed the windows with window straps subsequently covered by plasterboard during plastering. In the garage I have paint grade blocks and don't intend to plaster the walls. What's the best way to fit and finish around a window when not plastering?

 

I could buzz screws through the frame into the blocks. I can fit a window board I guess. I'd like to cover the underside of the lintel with something.

Edited October 30, 2023 by MortarThePoint

[j_s]

Ply box all round the reveal? 

[MortarThePoint]

2 hours ago, j_s said:

Ply box all round the reveal? 

 

Sounds reasonable. I'd have to mastic seal the box at its edge to the blockwork I guess

[Conor]

10 hours ago, MortarThePoint said:

 

Sounds reasonable. I'd have to mastic seal the box at its edge to the blockwork I guess

Second the ply box idea. Let it sit about 40mm proud and then template another strip of ply on the outer surface of the ply box to hide the gaps to the block. Kinda like a rebate. I did this with a box for a hidden toilet cistern cover and worked well. You just then seal up the ~2mm gap that's left.

 

Either use marine ply or varnish/PVA seal normal ply.

[Russell griffiths]

Pvcu trim comes in long lengths and various widths, won’t need painting, get it to match the colour of the window, or just white. 

Stick with some sort of no nails.