Lazy man's adhesive for pine joist to fibreglass reinforced gypsum ceiling

Originally Posted by ++Dan++

Hi guys,

I am about to replace some jarrah/karri termite damaged joists with treated pine and am looking for an easy fix without doing tedious fibre/plaster anchors.

Is there a ready mix (tub/cartrige) adhesive that would effectively grab dressed treated pine to fibreglass reinforced gypsum ceiling? Bostic/Gyprock stud adhesives don't seem to like the smooth finish of the pine without lots of nails wich from experience rip through.

The only other adhesive I can think of is liquid nails, but am yet to try it. I will level the ceiling from underneath with patio tubes/acrow props so will be able to exert a bit of pressure while the adhesive goes off. I can also wire brush/flap disk the ceiling, but not the pine due to the termite coating.

Any ideas to make this job as easy as possible are welcome

Thanks

The problem is the dusty nature of the fibrous plaster rather than the smoothness of the timber. The stud adhesive will stick to the timber ok. I would also screw the board to the joists.

Originally Posted by ++Dan++

The pine I used last time might also have been dusty then as It didn't seem to have ideal adhesion.

I was planning on vacuuming the paster board prior. Would slightly wetting the plaster and pine help?

Also are there any screws better than others at resisting pull though? Any spak that bonds to screw heads better than others?

Thanks

The best screwing method is to use double screws. The first screw nip up tight but not embedded, then the next screw beside it nip it up and embed just below the surface. Now embed the first screw. Using this method you wont get pull through. Just use normal plasterboard screws.

I would just use the adhesive as normal, coupled with the double screws at 300 mm centers you will have no problems.

Just use base coat or cornice adhesive to fill the screw holes, topped with top coat.