Upvc window fixings - idiot question.

[vwmark]

Hi. If I am ever going to be able to extend my workshop, I have to first do work on my house.
The house is 300-400 years old. Nothing square etc but hey-ho.
I am replacing 2 knackered wooden windows at the rear which cannot be seen by anyone so changing for upvc.
I bought the following fixings from screwfix but for me the design is floured. You position the widow, drill through the window the same diameter as the plug, insert plug and tighten. My issue is that the screw head is only 1mm bigger than the hole. My windows are quite small so to get the drill in, you have to angle it which creates an oval hole. The screw head only just caught.

What am I doing wrong or what type of fixings should I use?

Ideally, I would position the window, pilot drill to the stonework, remove window before drilling wall etc but doing that on you own and getting the window in position to line up the holes is difficult.

 

[Jacktegla]

Hi. If I am ever going to be able to extend my workshop, I have to first do work on my house.
The house is 300-400 years old. Nothing square etc but hey-ho.
I am replacing 2 knackered wooden windows at the rear which cannot be seen by anyone so changing for upvc.
I bought the following fixings from screwfix but for me the design is floured. You position the widow, drill through the window the same diameter as the plug, insert plug and tighten. My issue is that the screw head is only 1mm bigger than the hole. My windows are quite small so to get the drill in, you have to angle it which creates an oval hole. The screw head only just caught.

What am I doing wrong or what type of fixings should I use?

Ideally, I would position the window, pilot drill to the stonework, remove window before drilling wall etc but doing that on you own and getting the window in position to line up the holes is difficult.
View attachment 259674

Don't know anything about windows but if you do need a hand let us know.

 

[Nick DV]

Not used the SF ones before, but I drill the same size so they get through the UPVC ok, push them in and wind them in with a driver

 

[anto]

Torx headed concrete screws are what i have seen used. No need for a rawl plug and they have a decent shoulder to catch the window frame even if you have angled the drill bit.

 

[Nick DV]

The SF ones are in effect one piece as you don't put the plastic plug in first then the screw. really simple to use.

 

[Agroshield]

If you think about it, the fixings would work even if they had no head at all. They are in shear, not tension. If the window can move from side to side, needing the restraint of a head, your shimming is awry.

Buy a shorter drill bit. SDS bits come in many lengths.

Buy a shorter drilling machine. IME, cordless SDS are a lot longer than corded.

 

[gordon stephenson]

As post above, Fixing screws will have extra holding assistance from any sealing product used around the frames.

 

[eLuSiVeMiTe]

If the reveals are being decorated/repaired use brackets instead of drilling through the frame.

 

[R-D-R]

I kind of fell for this with a round UPVC window I thought I would make sure I can drive the screws home tight and put washers on so they didn't pull through the hole I drilled. Lesson learnt quick as pulling the Frame to the wall so tight distorted the frame. Aim to just nip it up to the shims.

 

[Fazerruss]

You can take the screw out and fit a penny washer if required. I've done this on odd occasions and makes a very secure fixing.

 

[Bravheart]

You probably need a right angle drill or right angle adaptor for the Chuck, but marking and removing the frame drilling and plugging holes then fitting frame again would be the way probably still needs right angle drill though.