DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Flooring > Bathroom floor on Pier and Beam




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Old 10-02-2011, 04:57 PM  
dw8
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Default Bathroom floor on Pier and Beam

In my part of the country we normally have slab on grade. This is my mothers home which is one of a few pier an beam homes in this area.

Original floor was:
Sub-SubFloor - 3/4 inch T&G pine layed at right angles to beam
SubFloor - MDF with 1/8 inch plywood laid on top.
Finished Floor - tile.

Where I'm at.
Cut flooring down to Sub-SubFloor at all wall plates (FWIW used an oscillating saw) and removed all damaged flooring.
Sub-SubFloor is bowed and cupped in places and appears to have 15 or 30 lb tar paper
sticking to to a number of boards.
Sub-SubFloor boards appear to be structurally OK, as well as the joints, but does appear to be water stained.

Questions:

Quote:
1) If water stains are from toilet (likely) can the Sub-SubFloor be saved or does it need to be replaced?
2) If saved, what is the best course of action?
(a) Wash boards with a bleach solution and what about the piers?
(b) Saw those boards that are cupped / bowed and renail?
(c). Get a floor sander and sand the boards as best as possible flat -- What about the sander sanding off nail tops?)
3) Replace Sub-SubFloor with CDX or ADX back to the joists closest to the walls?
Thanks
David


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Old 10-02-2011, 08:52 PM  
BigChuck
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I'll need a good Boston handyman when I move, but sorry I don't have the answers for your questions. Perhaps make a post in the general?



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Old 10-02-2011, 10:58 PM  
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Hard to answer questions or suggest repair procedures without seeing a few pix. Could you post a few?

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Old 10-02-2011, 11:08 PM  
dw8
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Thanks for responding.
Will take a few pix tomorrow am and post this thread.

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Old 10-03-2011, 08:37 AM  
dw8
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Pixs attached.
Tried to show cupping and bowing in boards but didn't show well.
-------------
You can see staining on the boards(pix2), so question still exists do boards:
1) Need to be bleach treated,
2) some other product,
3) or All removed and new sub-subfloor installed.
If new sub-subfloor, how should floor joists be treated?.
---------------
You can see the tar paper adhering to the boards(all pixs_. Really stuck on. The black you see is the tar paper --NOT-- mold.
-------------------------
Plan on replacing the boards around toilet flange.

photo20111003004.jpg   photo20111003005.jpg   photo20111003007.jpg  
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Old 10-03-2011, 02:41 PM  
nealtw
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Poke at it with a screw driver and compare it to boards that appear to be in good condition.

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Old 10-03-2011, 03:06 PM  
dw8
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As previously posted, boards are structurally sound. Tested with awl.
My primary issues are:
1) Since toilet water -- should boards be treated in some manner (bleach for example) or will using bleach cause nail corrosion and potential problems (boards loosing because of nail giving way) down the road?
2) Making sure all bows and cupping in the Sub-SubFloor are handled so no floor squeaks occur later on -- what is "best" solution other than new Sub-sub floor.

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Old 10-03-2011, 09:03 PM  
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If the wood is solid and has no signs of mould I wouldn,t worry about it. Bleach if you want, it won't hurt anything. For the joists and members below I would use a copper based treatment. As far as the cupping, you do want to get it flatter, if sanding just set the nails deeper. I think I would be taking out the bad stuff and putting in plywood as you are changing some anyway.

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Old 10-04-2011, 06:59 AM  
dw8
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nealtw: Thanks for responding.

Leaning toward ripping out and going back with plywood for sub-subfloor
By the time I set nails, sand, and mess around trying to determine if everything is level
I believe I can get out the entire old floor and replace with new. Will have to double-check on
one joist to make sure it is available for nailing at one end of the bath.

Not familiar with "copper based treatment" ? Years ago - I believe - they used to
soak wood with copper for termite protection (I believe they use glass impregnation now).
Is this why you recommended the copper?

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Old 10-04-2011, 07:17 AM  
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