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I need advice about spar and plywood for outdoors.

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Forum topic by RussellAP posted 734 days ago 451 views 0 times favorited 9 replies Add to Favorites Watch
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RussellAP

2944 posts in 913 days


734 days ago

Back in March this year I bought a 8’x10 shed. I didn’t have any time to put it together and it got really hot so I let it sit. Now I’m going to put it together.

I got some 4 inch cinder blocks to put down on the ground first in a outline of the shed and some under it where the 4×4’s will sit on top and some 2×4’s to make a frame for the plywood.

The plywood is laying out in the driveway and I’ve sparred the top and sides and sealed them up real good.

My question is, should I seal the other side, or do I need to let it breathe on one side?

-- A positive attitude will take you much further than positive thinking ever will.


9 replies so far

View Loren's profile

Loren

7399 posts in 2275 days


#1 posted 734 days ago

You can seal the unfinished side if you want. In an unsupported
panel finished on one side only will warp due to uneven moisture
absortion on the finished vs unfinished side.

I would finish it, personally. Paint it if you want. White paint
inside a shed can make it easier to see in there.

-- http://lawoodworking.com

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RussellAP

2944 posts in 913 days


#2 posted 734 days ago

Loren, I’m not worried about warping, it will be screwed down to a frame. I just wondered if the up side of the sheet needed treating seeing it’ll be on the inside of the shed and all. I guess I could assemble the base of the shed and roll the paint on that way. I just need to get this thing put together because I have stuff all over the yard, three ladders, yard equipment and I’d like a place to store some of my chairs this winter.

-- A positive attitude will take you much further than positive thinking ever will.

View Bill White's profile

Bill White

3404 posts in 2587 days


#3 posted 734 days ago

Russell, Shame on you for working on your chair business when ya shoulda been puttin’ the shed together. (Jokin’ of course.)
Might wanna put some heavy mil plastic down on the ground before the flooring goes in. It’ll keep the moisture somewhat controlled. Just a thought.
Bill

-- bill@magraphics.us

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a1Jim

112011 posts in 2204 days


#4 posted 734 days ago

You don’t need to use spar varnish inside primer& paint won’t hurt on both sides. I would use 6” blocks and put down a 6 mil vapor barrier on the ground before build your storage unit. plywood does not need to breathe .
Edit
looks like Bill and I were typing the same thing at the same time LOL

-- http://artisticwoodstudio.com Custom furniture

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RussellAP

2944 posts in 913 days


#5 posted 734 days ago

Good to know guys, I happen to have some 4 mil polyethylene on hand.

Jim, I already have the blocks, I think that 4” and then a 4×4 frame on top of that is high enough off the ground, I don’t want to have to build steps.
Also the bottom will be very open for air flow.

-- A positive attitude will take you much further than positive thinking ever will.

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a1Jim

112011 posts in 2204 days


#6 posted 734 days ago

when you have only 4” you will have more ground contact for your wood. Another point is that 4×4s are not meant to be horizontal structural members. If you use 6” blocks all you will need for a step is some 8” blocks laying their side for steps .

-- http://artisticwoodstudio.com Custom furniture

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RussellAP

2944 posts in 913 days


#7 posted 734 days ago

Jim, the blocks are only an outline of just under the 4×4’s, it’s not a solid block floor. I’m just using them to get it up off the ground. I think with the polyethylene under it, it should do okay. The base is likely to outlive the shed.

-- A positive attitude will take you much further than positive thinking ever will.

View a1Jim's profile

a1Jim

112011 posts in 2204 days


#8 posted 734 days ago

Yes Russ I understand, that part of your construction is fairly standard. I think I’m being a building snob so I’ll stop harassing you. I know you will build it the way you have planned ,like most of us would. I hope it goes together for you quickly and holds up well.

-- http://artisticwoodstudio.com Custom furniture

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RussellAP

2944 posts in 913 days


#9 posted 734 days ago

I must admit, I’ve been a bit intimidated with the thought of assembly which is the main reason I’ve put it off. The ground where I’m putting it tends to be soggy when it rains a lot, but it’s bone dry now. We live on a slab of clay that drains very slowly, however the area I’ve chosen is not so bad as the rest of the yard, so I think with that poly under it and the treated wood on top of blocks, (and yes, I do have a roll of styro to put down under the wood), the base will outlast me.

-- A positive attitude will take you much further than positive thinking ever will.

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