DIY fitting a UPVC window advice needed

[Mech Tech RAF]

Evening chaps, i'll be replacing an old rotten wood window tomorrow (1st floor bathroom single pane side opening 600x600ish) but i need to check something with you more knowledgeable folks...


the window is slightly smaller than the one it'll be replacing (seems to be a necessity to account for expansion etc), but what are the best fixings to use to actually secure the frame to the sides of the opening? read a few different ways but thought there must be a window fitter on here somewhere who can give more definite advice :-)

also... if i need to tidy up the render (the house is rendered) round the opening, is it ok to patch it up and leave it exposed to the elements for a while until i get round to painting the whole house?

got one of those ready made cavity closer jobbies to sort out the gap round the bottom and sides, im assuming ill be alright to just dot and dab plasterboard over the top to make a good finish of the reveals on the inside?


cheers in advance, John

[Mech Tech RAF]

the gap round the edge of the frame to the blocks do you mean?

[Mech Tech RAF]

(cheers for the speedy replies by the way fellas)

[Mech Tech RAF]

m4ckg said:

You need the fixings B17NNS has recommended. You won't need to use plastic packers, just some expanding foam

cool, i'll see if good ol' screwfix has some in stock near me so I can grab them on my way past in the morning.


thanks chaps, 'tis much appreciated :-)


John