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Old 08-11-2006, 07:45 PM   #1
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Hardwood Underlayment


Most sources seem to list basic roof felt as the standard layer to be place on a subfloor before nailing down hardwood. I'm looking to reduce the transmitted noise a bit to the rooms below and perhaps give a little more cushion to the wood floor itself. I've found a couple other items, such as "insulayment" (http://www.mpglobalproducts.com/insulayment/1intro.html) that claim to do just this, but I cannot find anyone who has used them or can recommend them.
Is there anyone out there that has used something other than standard felt and liked it?

Thanks,
Wally

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Old 08-16-2006, 12:36 AM   #2
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Hardwood Underlayment


I wouldn't recommend anything like that because the nails are not designed to hold if nailed through anything but plywood or OSB.

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Old 08-16-2006, 12:37 AM   #3
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Hardwood Underlayment


One thing you could do is blow insulation between the floor joist.
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Old 08-16-2006, 01:42 PM   #4
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Hardwood Underlayment


My basement floor is concrete. I put a thick plastic then OSB on top. Can I lay hardwood on it then, as you said hardwood can lay on OSB... would the nails for the hardwood be to long that the concrete get into its way... or there are just right length hard wood nails for which make it just pass the OSB without striking the concrete.... I need to lay either laminate or hardwood on a show room in the basement, my wife's new business,... or should I use floating hardwood or liquid nails...
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Old 08-16-2006, 10:15 PM   #5
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Hardwood Underlayment


Actually, you are not supposed to put solid hardwood flooring below grade whether it is on OSB or plywood. There are some exceptions to the rule...like all rules...but that implies some serious climate and humidity control.

You can use engineered flooring though.
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Old 08-17-2006, 09:31 AM   #6
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Hardwood Underlayment


Thank you Donedat... I know my basement is quite moisture proof... but I will follow your advice to use laminate anyway...
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Old 08-17-2006, 11:47 PM   #7
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Hardwood Underlayment


Still, even with laminate or engineered, you should read the instructions. All wood or simulated wood has moisture limits and it's usually around 14% subfloor moisture content and maintaining between 40% and 60% (on the lower end if possible) consistent room humidity and temperatures between 55 and 72 degrees.

Every box of product comes with instructions.
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Old 08-18-2006, 10:26 AM   #8
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Hardwood Underlayment


man, I can tell you are an expect when you throw out all these numbers....
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Old 08-20-2006, 04:38 PM   #9
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Hardwood Underlayment


I'm not trying to discourage you from your project. There is product for each application though. Most products have web-sites with all their applications. I just installed some laminate the other day that had restrictions on where it could be installed.
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Old 08-21-2006, 09:08 AM   #10
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Hardwood Underlayment


Quote:
Originally Posted by Donedat
I wouldn't recommend anything like that because the nails are not designed to hold if nailed through anything but plywood or OSB.
Donedat

What about the armstrong underlayment that is black and has a foam side an a plastic or vinyl side, that was designed to be placed under their floors or is that for engineered or laminate only????

I only ask as i have used this product in the past on some jobs that i have done and have no problems yet although all of those jobs are 2nd floor or main floor above a crawl space.
Also what about going over vinyl laminate flooring with engineered or real hardwood where do you stand on that?
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Old 12-18-2007, 10:17 AM   #11
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Hardwood Underlayment


I have just poured a concrete slab and would like to know how to put hardwood flooring down.
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Old 12-25-2007, 10:47 PM   #12
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Hardwood Underlayment


I noticed that one of your goals in putting down this underlayment is sound attenuation. Putting an underlayment beneath a nail-down floor does help a little bit, but the nails that you're piercing it with act as sound conductors, so you may not get the full 60db of sound attentuation. I think the link you had to the insulayment notes that it should be used for engineered floors, not nail-down ones. If you're looking for cushioning you could try a sound solution underlayment which is relatively inexpensive ($.40/SF, foam padding) and will soften up the floor. Fact of the matter is that any underlayment you put under the prior to installation is going to dampen sound and soften up the floor a little bit.

If you really want to get great sound attentuation you can use a stapled/floated 1/2" plywood sub-floor system with these sound attentuation boards (4X8) that I can't remember the name of ... but that's a story for another time.

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