Standard drywall screws rust very quickly when used in the wet.
Any recommendations for screws for the water resistant versions of plasterboard? One of the boards I looked at had its own screws, but there was nothing to say they were plated or protected in any way from damp, and they just looked like really expensive drywall screws.
There is nothing to stop you using stainless pozi screws. You just have to be careful how far you screw them in as they wont cam out like drywall screws.
Stainless, 3.5mm so quite fine, good sharp tip, drill/cutting thread should clear the PB without cracking and the heads have flutes which should allow them to countersink again without undue stress.
I think it's a case of suck it and see - but I used a heavier version of this make of screw (5mm/30mm) to install guttering into cedar boards and I was very impressed.
Stainless, 3.5mm so quite fine, good sharp tip, drill/cutting thread should clear the PB without cracking and the heads have flutes which should allow them to countersink again without undue stress.
I think it's a case of suck it and see - but I used a heavier version of this make of screw (5mm/30mm) to install guttering into cedar boards and I was very impressed. /q
Yup suck n see, tho watch how hard you drive them they are brittle especially the thinner ones IME
If you cut through the paper you lose a lot of the strength. But very near the edge may be an exception as the edges can bulge out. But plasterboard i s usually a lightweight plaster that can take a bit of compression. I took down some really old plasterboard in my house and it was basically just pla ster of paris - very rigid with sharp edges where it cracked ! Simon.
- show quoted text - If you cut through the paper you lose a lot of the strength. But very near the edge may be an exception as the edges can bulge out. But plasterboard i s usually a lightweight plaster that can take a bit of compression. I took down some really old plasterboard in my house and it was basically just pla ster of paris - very rigid with sharp edges where it cracked ! Simon. /q
Remember, this isn't plasterboard - it's cement board. To look at it, it doesn't look like it has a surface layer, although the cutting instructions (score and snap) claim it does, but it's probably not paper. I haven't yet tried to make a hole in it yet.
ear the edge may be an exception as the edges can bulge out. But plasterboa rd is usually a lightweight plaster that can take a bit of compression. I t ook down some really old plasterboard in my house and it was basically just plaster of paris - very rigid with sharp edges where it cracked !
The stuff I've used (Knauf IIRC) has, on both sides, just below the surface , a ?fibreglass? mesh (similar to plastering scrim but thicker and in board
-sized sheets).
I don't recall it having a "surface layer" per se, think it's just "cement" with 2 X fibreglass layers - a sandwich.
making holes is OK though it's very abrasive and shags normal hole saws and drill bits pretty quickly, & anything "powered" makes lots of 'kin 'orribl e fine dust....
If they suggest that you can use plasterboard screws then they don't cut the surface but compress it. I would use a stainless screw that does the same.
ear the edge may be an exception as the edges can bulge out. But plasterboa rd is usually a lightweight plaster that can take a bit of compression. I t ook down some really old plasterboard in my house and it was basically just plaster of paris - very rigid with sharp edges where it cracked !
Ah well, there are various types of waterproof wallboard for bathrooms. Som e are a sandwich construction. I used something like "viroc", was a cement board with some type of "mineralised" cellulose filler. I used aquapanel sc rews on it which have little projections on the back of the screw heads for self countersinking. But I think I just countersunk the holes anyway when I fitted it. Simon.
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