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bottom plate of basement partition wall

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Forum topic by rjherald posted 08-18-2018 08:16 PM 693 views 0 times favorited 8 replies Add to Favorites Watch
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rjherald

18 posts in 481 days


08-18-2018 08:16 PM

Topic tags/keywords: question

i know this is not exactly woodworking but i was wondering if anyone had seen this before. Part of our basement is unfinished but framed and the bottom plate seems to be a regular 2×4 sitting on a piece of some sort of wood white in color and about ½” thick. the bottom plate does not look like pressure treated lumber. Has anyone seen or heard of this? I thought code was always PT lumber when in contact with concrete. thanks

rjherald

-- rjherald, indianapolis


8 replies so far

View John Smith's profile

John Smith

1443 posts in 338 days


#1 posted 08-18-2018 08:43 PM

this is one of those times where photos would really help with the accurate feedback.

.

.

-- I started out with nothing in life ~ and still have most of it left.

View CaptainKlutz's profile

CaptainKlutz

532 posts in 1670 days


#2 posted 08-18-2018 08:56 PM

White wood? Did you check if it was foam insulation?
Many building codes allow use of foam sill gasket under frame wall on concrete, basically to reduce moisture uptake in wood. 1/2 inch thick seems thicker than off-the-shelf white/pink sill gasket I used in past, as it is more like 1/4” thick uncompressed. Pictures are only way to really help.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View rjherald's profile

rjherald

18 posts in 481 days


#3 posted 08-18-2018 11:01 PM

thanks for the reply here is the picture

rjherald

-- rjherald, indianapolis

View John Smith's profile

John Smith

1443 posts in 338 days


#4 posted 08-19-2018 02:09 AM

how old is the building ?
without digging a piece of it out with a screwdriver and having it
analyzed at the local box store, there is no way to really tell what it is from here.

.

-- I started out with nothing in life ~ and still have most of it left.

View Firewood's profile

Firewood

487 posts in 1810 days


#5 posted 08-19-2018 02:43 AM

If I had to make a guess, I’d say it’s a PVC board. But that is only my unprofessional guess. It would provide the barrier needed to prevent water wicking into the 2×4, but why go through that rather than just use PT lumber?

-- Mike - Waukesha, WI

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rjherald

18 posts in 481 days


#6 posted 08-19-2018 03:32 AM

i thought pvc my self. the house is only 8 years old and i was just curious as to why the builders did it this way. thanks for the help

rjherald

-- rjherald, indianapolis

View Woodknack's profile

Woodknack

12401 posts in 2556 days


#7 posted 08-19-2018 05:23 AM

You could sweep a few years of crud and cobwebs away and poke it with a screwdriver to see if it’s foam, dentable like wood, or hard like pvc. Hard to identify something by color alone.

-- Rick M, http://thewoodknack.blogspot.com/

View Fresch's profile

Fresch

344 posts in 2097 days


#8 posted 08-19-2018 10:47 AM

And your wood has a green tint in your picture on my screen so could be pt.

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