What size screws do I need for UPVC windows? (2024)

FAQs

What size screws do I need for UPVC windows? ›

Most uPVC profiles are 60 to 70mm, so using a 40mm screw should prevent it from going through the frame and out the other side. Create a pilot hole 1mm smaller than the screw size you intend to use, so the screw gets a good purchase in the frame.

Using #8 x 40 posidrive screws, secure the bottom of the window to the cill, 150 mm from each internal corner and 600 mm centres thereafter. Secure the window jambs into the brickwork surround using 8 x 100 mm fixing bolts, again 150 mm from each corner and at +/- 600 mm centres thereafter.

Yes, you can drill into uPVC windows - for example you may want to fit blinds to your windows. However, doing so may compromise your guarantee. If you are unsure, then it is always best to speak to a qualified installer. There are a number of things that you should consider when drilling into a UPVC window frame.

APPROVED FASTENERS

WOOD FRAMED CONSTRUCTION: #8 pan head screw, which penetrates framing member at least 1-1/2”, or nail with 3/8” minimum head diameter, which penetrates framing member at least 2”. STEEL CONSTRUCTION: #8 sheet metal screw, which penetrates the framing member at least 3 threads.

A high-speed steel (HSS) drill bit or a cobalt drill bit are both good options. Second, be careful not to apply too much pressure when drilling. UPVC is a relatively soft material, so it is easy to overdrill and create a hole that is too large. To avoid this, use a gentle, steady pressure and go slowly.

The top-selling product within PVC Screws is the DeckLok #10 x 2-3/4 in. Star Drive Self-Countersinking Flat Head ACQ Compatible Gray Composite Deck Screws (350 per Pack).

The best screws for PVC trim come from Cortex. They come in a kit that includes a bit, plugs and screws. All you do is drill the screw through the trim. Once the desired depth is reached, the bit will completely stop the screw.

The screw's length is essential when choosing the right screw size. While thicker materials may require longer fasteners for a firm hold, short screws may be suitable for thinner materials. The general rule is that the screw should enter at least half of the attached material's thickness.

In the case of vinyl window frames, always prefer using stainless steel screws with coarse threads and pan or oval heads. When it comes to metal window frames, use stainless steel screws with fine threads and pan or hex heads.

Pick the screw length: Ideally, you should choose a fastener that's about half as long as the material it's going into. If the screw is less than half the length of the receiving material, it won't anchor properly. If you pick a screw that's much longer than half, you may damage the other side of the material.

Do you need special screws for uPVC? ›

Use the correct screw type

For uPVC window frames, the screw that experts recommend using is a self-tapping style screw.

For the best uPVC window security, consider a Secured By Design locking mechanism, hinge-side security brackets and internal beading. Alongside doors, windows are a vulnerable point of entry to your home for intruders.

Your uPVC window will have come with fixing screws that are used to anchor it into the wall. Use your electric drill and a Philips head bit to drive the 8 fixing screws through the frame. Drive the screws in until they're tight, but make sure not to overtighten them in the wall.

Wear gloves and use PVC fillers to secure the holes. Apply the PVC fillers inside the interior patch as well. Press firmly and seal the edges with more gap filler. Let the filler dry for 24 hours.

The standard size of uPVC windows varies depending on the specific style, but generally, they range from 488mm to 1,770mm in width and 488mm to 1,500mm in height in the UK.

The pair of door handle screw bolts are the most common sized found on door handles and are a 5mm diameter M5 machine thread with an overall length of 70mm.