So, as part of a larger job, I have had an instruction to install 3x layers of 18mm ply over 100 sq. m over concrete. A couple of questions, How would you fix the three layers What would your price be ? Its supply & fix, sheet safety going over the top I know prices are not supposed to go on, but hopefully, as this is nothing like a normal install it might be ok ? Cheers
Sounds like fun Id of thought mechanical fixing first sheet, Followed by adhesive and screws 2nd and third! Labour will be through the roof
I would stick down first layer with wood glue. Few fixings where needed. Next two screwed down. Day rate Sent from my iPhone using Tapatalk
£ a screw Retirement fund right there....I'd they pay it. Like it's been said, glue base layer and screw the other 2 down. Is the floor that low/ needs to be that high?
Why don’t they just flood it with a 54mm screed? It would be much cheaper, what’s the Rh of the concrete I wouldn’t be comfortable bonding directly to a concrete base like that especially so many layers. Sent from my iPhone using Tapatalk
So, the job is in a gym. The gym is on the ground floor of a large building, with private flats above. Part of the lease agreement, is sound transfer, and there are a lot of mitigation measures. Part of the floor is having 18mm rubber, then we overlay 2x sheets of ply, laid at 90 degrees, fixed together, but not to the sub floor. Another area, which is having the safety floor, needs to built up, to this same level, hence 3x layers of 18mm, but this can be fixed to the sub floor. I was thinking drill, plug & screw the first layer. Then the next layers F3 & 28mm coil nails. Day rates not really an option. Its all on price, supply & fix. Don`t know what the RH is, I have not made a site visit yet. I don`t think screed would be cheaper, maybe around 350 bags to get to that depth. Maybe using concrete screed it would be cheaper.
Open areas? What about cement boards? Could speak to a company called selecta about raising it with insulation and then install 22mm or 18mm cement board over it. Or does it have to be wood? If it needs a dpm you will have to stick the first layer down. Wouldnt be a issue with a good notch trowel. Not cheap tho. Probably £600-£1000 on glue for the base depending what you use. Sent from my iPhone using Tapatalk
£10 per m2? Per layer? Plus materials and costs. A liquid screed would probably be around £3000 but you have the drying time. Your gonna be double that materials and labour? Sent from my iPhone using Tapatalk
The spec is 3no. 18mm ply, but I could probably change it. Having said that if there is a risk of failure I would then be liable. I was thinking in the region of a tenner plus fixings and cost of materials. Its not an open area. Several rooms and odd areas. Its going to be a lot of ply, around 350 sheets. Better look for a board trolley !
I'd go with glue, drill plug the first. Glue and screw/nail the remaining 2 layers as you said Neil. At least that would be my stance if all the conditions are good. Keep us posted
I have had some more thoughts. We did something similar before, for a main contractor & he hired in a Hilti nailer. 50mm nails, and gave a good fixing. I did a rough calc on fixings and its coming at over 1k plus the nailer though. It would be much quicker than drill/plug/screw....
I’ve got one I use it for skirting boards but not tried fixing ply down with it. Funny thing is the reason I bought it was to glue and fix down 18mm ply to screed but we never got the job Sent from my iPhone using Tapatalk
I've used the Hilti bx3, powerful beast. The cost of the nails is what sets you back.hilti give you the gun for free if you purchase a ton of nails. I'd still say with drill plug the 1st layer and f3. Then the next 2 layers fly over with an autofeed gun and the collated screws. You could save time by using 42mm screws and just going through both layers in 1 go. The senco duraspin 110v gun is an animal. Great result when I've used that gun, never jams up and the cost of them is reasonable. You can buy a range that covers from 25mm up to 75mm. Just for added peace of mind, as you drop the 3rd layer over the 2nd you could splash out some f3 on that for extra grab
Sounds exactly like something I would do. Get geared up for a job, before it comes through I`ve got an purchase order for this one, so should be ok
