Fastening underlayment to subfloor
#1
04-01-14, 06:00 PM
Fastening underlayment to subfloor
I am a DIY Homeowner replacing the 20-year-old particle board floor in the bathroom of my 1995 Manufactured Home. I am using 5/8 inch OSB for the subfloor and 1/4" plywood for the underlayment, and am going to cover it with sheet vinyl.
I have read numerous threads regarding screws versus nails (versus staples), but no one has addressed this question, as far as I can see: Since all such mechanical fasteners will probably mar the smooth surface of the underlayment, why can't it just be secured with construction adhesive?
No dimples, no screws too deep or protuding, the smooth surface would be unmarred and not need to be smoothed out with filler.
What am I missing . . . it seems such an easy idea.
I have read numerous threads regarding screws versus nails (versus staples), but no one has addressed this question, as far as I can see: Since all such mechanical fasteners will probably mar the smooth surface of the underlayment, why can't it just be secured with construction adhesive?
No dimples, no screws too deep or protuding, the smooth surface would be unmarred and not need to be smoothed out with filler.
What am I missing . . . it seems such an easy idea.
#2
04-01-14, 06:06 PM
Welcome to the forums. Your second layer of subflooring should be screwed to the lower layer with decking screws, intentionally missing the joists. It is a good idea to screw down the original layer to the joists. Use 7/8" narrow crown staples for the 1/4" layer of plywood (not luan) and set the pressure to where the staples set well, don't stand proud, and don't blow through.
#3
04-01-14, 10:15 PM
Banned. Rule And/Or Policy Violation
You would be far better off using T & G 3/4" Advantech subflooring.
It comes with a limited life time warranty.
#1, 5/8" is to thin.
#2, CDX is full of voids and flaws, will delaminate with any moisture.
Use construction adhesive on top of the floor joist when Installing the subflooring.
Using the narrow crown staples will leave such tiny holes they do not need to be filled.
The seams and any flaws will still need to be filled.
It comes with a limited life time warranty.
#1, 5/8" is to thin.
#2, CDX is full of voids and flaws, will delaminate with any moisture.
Use construction adhesive on top of the floor joist when Installing the subflooring.
Using the narrow crown staples will leave such tiny holes they do not need to be filled.
The seams and any flaws will still need to be filled.
#4
04-04-14, 03:42 PM
That was my first and only choice, Joe, but the morning I tried to place my order at our local Lowe's, it was no longer listed on their site. I contacted Huber Engineered Woods website, and the only places where Advantech is now sold in arizona is in 7 towns up north, where the weather is colder and wetter than here in Tucson.
I don't get it. Floors that are going to get wet (Kitchens, Bathrooms, Mudrooms, etc.) are going to have moisture problems even in the driest climes!
No one in Tucson carries it or even a product claiming to be comparable. I'm stuck with OSB, but plan to waterproof it wiht Thompsons Water Seal before installation.
I don't get it. Floors that are going to get wet (Kitchens, Bathrooms, Mudrooms, etc.) are going to have moisture problems even in the driest climes!
No one in Tucson carries it or even a product claiming to be comparable. I'm stuck with OSB, but plan to waterproof it wiht Thompsons Water Seal before installation.
