by thedoctor »
Mon Jun 18, 2007 8:42 am
Not for us to say whether "worrying" is right but you are certainly right to take care when laying any kind of floor in a bathroom. Its usual to lay a plywood floor over the existing floor (18 or 22mm ply) and screw it through the existing floor, into the joists, every 400mm in both directions. THis will give you a solid, flat base for any new flooring and prevent movement in the timber floor if you wanted to lay ceramic or quarry floor tiles. The ply needs to be treated with 1 coat of PVA adhesive diluted with water to 50/50 and then, when dry, a coat of PVA undiluted. See our project on PVA. The PVA is required before you lay tiles which need adhesive but not necessary for laminate.