I am about to install a timber floor on concrete base . I have to raise floor betwen 100mm and 115 mm.

The floor is basically flat but has a slight fall of 15 mm over 12meters .

The question is how to install a base for the floor . I am thinking about 145 x 45 bearers cut to size and anchored with a pins like Powers Spike or mascin pins every 600 mm .

I will have to drill hole and rebate to allow 100 mm pins to penetrate concrete by 45 mm

What is the best and most suitable l means of installing and anchoring bearers to concrete .

Or is there another way

Thanks for the question. Admittedly, I don't understand all your terms. But I think I get the basis of your question. You want to install " bearers"/ wood strips at a certain dimension on top of a concrete slab. Your idea is to use some type of fastener. There are various ways it's done here in the U.S. Sometimes, the sleepers/screeds/bearers are shot down with a powder-activated nailing gun. There are pneumatic ones as well. Generally, these work fine. But installing concrete anchors with bolts is much better and ensures a permanent attachment. Adhesive works well also, but then one cannot loose lay a moisture vapor barrier ( plastic sheeting ) over the slab.
You could apply one the viscous type moisture vapor retarders, like Bostik's MVP, then nail and glue the bearers over that. That would be an expensive option over loose lay plastic sheeting. I don't know if you're in another country or a recent immigrant. Here in the states, we're still using inch, foot, yard, mile, cup, pint quart, gallon, forms of measurement. Not the metric. So although I could/should look of a conversion chart, I'm not into it right now. As long as those bearers are 3.5" wide and 1.5" think x random length, spaced 12" apart, you can lay T&G flooring directly over those, if the flooring is T&G and at least 3/4" and nailed down. Another fine option many use is top lay 3/4 plywood over the concrete and nail those panels down over plastic sheeting. Many do that and it lowers the substrate by 3/4".
That's about all I can offer at the moment. I hope others will chime in with suggestions.

Tapcons are the best. You can order them at this website and also watch the video. Note, not all screws are made as well as these. Read about the coating and plus these are stainless steel.


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