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Old 04-12-2017, 05:06 PM   #1
wcheaib
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Default Subfloor

Hello All - I am in the midst of renovating my basement. I have decided to install finished on-site engineered hardwood. My contractor recommended that I install a subfloor (5/8th inches) above dimple board. I noticed that he is pre-drilling through the concrete every 16" and inserting a 3" tapscon screw. I am far from an expert in home renovations, let alone subfloor installs, but should he be drilling all the way through the concrete slab? I am concerned about a few things: (1) water penetration, (2) cracks in the slabs given the number of holes I have now, and (3) loose screws given there is nothing in front of the screw now. Should he not just drill a little more than the length of the screw, vacuum the excess powder and screw the tapscon in? Appreciate your thoughts on this.

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Old 04-12-2017, 06:03 PM   #2
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Any moisture barrier you had is now gone. He is doing it wrong.


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Old 04-12-2017, 06:06 PM   #3
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Thanks. But it is a fixed system as opposed to a floating system so he does have to nail/screw through the concrete. Are you saying the fact that he went all the way though is wrong? Or screwing into concrete through the dimple board is wrong? thanks again
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Old 04-12-2017, 08:10 PM   #4
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Whats a dimple board? Most slabs are 4 inches out here in the southwest - land of concrete.
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Old 04-12-2017, 08:18 PM   #5
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there 4" here to E on the east coast.
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Old 04-12-2017, 09:29 PM   #6
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4" here too and if he drilled all the way through, the vapor barrier is gone.


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"but should he be drilling all the way through the concrete slab? "
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Old 04-12-2017, 09:44 PM   #7
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We have 4" of concrete here in Toronto as well. The dimple board is called DMX 1-Step. And yes he pre-drilled all the way through the slab (basically hit the gravel). Sorry - what do you mean by "the vapor barrier is gone". Does that mean water can penetrate through the tapscon screws up into the hardwood? Thanks again
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Old 04-12-2017, 10:27 PM   #8
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Quote:
Originally Posted by wcheaib View Post
We have 4" of concrete here in Toronto as well. The dimple board is called DMX 1-Step. And yes he pre-drilled all the way through the slab (basically hit the gravel). Sorry - what do you mean by "the vapor barrier is gone". Does that mean water can penetrate through the tapscon screws up into the hardwood? Thanks again
Yes it can. Plastic sheeting is installed before the slab is poured to keep out water vapor. He probably put holes in it.
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Old 04-12-2017, 10:49 PM   #9
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I am certain I have no plastic sheet as we had to break the concrete to move a bathroom. What I do have is some gravel underneath the slab.
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Old 04-12-2017, 11:12 PM   #10
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Quote:
Originally Posted by wcheaib View Post
We have 4" of concrete here in Toronto as well. The dimple board is called DMX 1-Step. And yes he pre-drilled all the way through the slab (basically hit the gravel). Sorry - what do you mean by "the vapor barrier is gone". Does that mean water can penetrate through the tapscon screws up into the hardwood? Thanks again
I Googled this DMX 1-Step and I would wonder not knowing much?
Seems strange to a lino layer
What you timber guys reckon?



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