When glue is used in conjunction with screws and nails the bond is strong enough to resist natural movement of the wood.
Too much glue hardwood to concretr.
The adhesive manufacturer should have instructions regarding specific trowel requirements.
For best results several areas of each room should be tested for excess moisture.
Applications are more prominent with residential construction in sunbelt areas commercial locations and high rise dwellings.
Concrete has a dull black finish that i think is from the previous glue that was used 1966 and has some remnant dust from the homosote.
We have scraped and vacuumed and the concrete seems ready for the new glue for our subfloor sound deadening mat to which the 5 8 x 5 engineered oak floor will be glued.
The manufacturer should have recommendations for how wide the expansion gaps need to be.
The installation of hardwood floors by the glue down method is used predominately on concrete slabs.
Gluing down solid wood flooring to concretethis is a question that i have started to receive more and more.
This is a common mistake with newcomers to the do it yourself hardwood flooring field.
Glue is a secondary method of attachment for bonding wood to concrete.
But the catch is that the solid wood flooring we have that can be glued over concrete and warranted is 5 16 and 7 16 solid hardwood not 3 4 solid hardwood and can be only on on grade and suspended concrete.
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If tests indicate too much moisture is in the slab do not install hardwood floors.
Glue forms the initial bond but without screws and nails the natural expansion and contraction of the wood can break or weaken the glue.
Use the trowel to get adhesive all over the starting corner.
Installing engineered hardwood flooring over concrete too tight against a stationary object will not allow room for normal expansion and may cause a failure.
They use too much adhesive thinking that more is better and the panels will be more secure this way.
Concrete slabs whether new or existing must be dry before the subfloor is installed.