I have got a 1 shot delamination kit from eBay, I have a spongy floor at parts, it also has a dip, so i was thinking i would place a 3X1 timber on its edge on the floor then screw through the timber into the ply which would pull the ply up to the timber and create a flat surface.
I am just worried then would the glue bridge that gap between the underside of the ply and the aeroboard? Also would this mean I would need more glue than expected, the pack is meant to cover 1 meter squared but would this not be the case with my approach?
Has anyone any good resources or tutorials on how to do this.
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Hi and welcome to the forum. Hopefully the dip is just in the ply because the underlying foam has degraded so provided there isn't too much distance between holes, you use dowels to reinforce the repair and use sufficient one-shot then the void should be filled with the replacement material as it expands. A little of the one-shot makes a lot of foam so balance how much you put in, too little won't do the job properly but too much will be very messy as it oozes out the holes all over your floor. It is generally activated by a reaction with water so I always soak my dowel pins a few hours before hand.
One shot is not as powerful an expansion process as the twin pack so it may well be a good idea to lift the ply up to level again as you suggest.
Dave.
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Never used that type of restoration kit, so can't speak from experience.
Thinking about your dip, is it the entire thickness of floor that has dipped (is the underside sagging too), or only depression of the top ply with collapse of the inner foam?
If the entire floor has sagged, may it not be better to push up from underneath to flatten it? Even potentially leaving screwed battens on underside of floor as reinforcement.
If trying to pull up top ply alone, risk you will only pull up locally around screws, even 'bursting' the ply upwards, rather than pulling the entire sunken floor up! Bearing in mind the integrity of the construction has already deteriorated and will be relatively weak!
Thanks for all the responses, yea I think maybe the floor itself has sunk a bit, was thinking the glue would fill between the ply and aeroboard. How important is propping up underneath when doing the work if I work backwards and don't put my weight on it. I don't want to make it a massive job with battons left on permanently underneath really.
I've used floor deamination kits several times. I've always find better to use to much than not enough. It's ozzes out above the dowels but the day it's super easy to remove with a multi tool.