Questions tagged [pressure-treated]

Wood that has been treated to resist rot and insects, and thus can be used outdoors. Use in conjunction with questions about the wood and its uses. Please include any relevant project tags as well (such as [fence] or [deck])

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1answer
43 views

Post protector (or something else) to extend life of existing deck 4x4 posts?

I'm resurfacing a deck. It was built 19-20 years ago. Had an inspection and was recommended to replace 4x4 direct-bury posts with 6x6 with concrete piers/footings. This work isn't as simple as ...
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1answer
30 views

How to treat wood to use in a deck

I'd like to build a small (6'x8') floating deck for my yard. The deck would be resting on gravel. Ideally I'd like to use pressure treated wood, but a few of the pieces will need cuts, and my local ...
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52 views

Used coated sinkers in shed frame

I'm building a 10x14 shed with pressure-treated 2x4 frames. I just finished the frames when I realized that the nails I used - 12d 3 1/8" coated sinkers, are not recommended for use in pressure-...
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28 views

Staining deck with a few newly replaced boards

I bought a two-story condo that has two back decks and a roof deck, all with at least a few planks damaged beyond repair, but 95% in good enough condition to re-finish. We live two blocks from the ...
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1answer
79 views

Glue or fill crack in pressure treated post?

I installed this 6x6 pressure treated post last year. The only load on it is a hammock. It has developed a large split. Should I use an exterior wood filler to fill it, or waterproof wood glue and ...
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1answer
55 views

OK to forego vapor barrier under concrete slab if pressure-treated sill plate is used along with sill gasket?

Is it OK to forego installing a vapor barrier beneath a concrete slab (garden shed foundation) under the following set of circumstances? there will never be any flooring material placed on the slab ...
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0answers
26 views

Waiting a year before applying semi-solid stain to new treated pine deck?

We had a new pressure-treated pine deck installed about six months ago. I know the wood has aged/dried enough to take a semi-ttransparent stain. But we prefer the appearance of a semi-solid stain like ...
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1answer
80 views

Are metal anchors or buried posts better for 6 x 6 posts for a pavilion?

I'm trying to figure out the best way to set 6 x 6 posts for a pavilion. I'm considering the two methods below. I know they both have their good and bad points. I believe the first will extend the ...
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2answers
61 views

Raised shed floor

Did I make a error? Should my joists be pressure treated?
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1answer
62 views

Will salty water from ice melt harm a wooden porch?

I rebuilt our covered porch out of pressure treated lumber a couple of summers ago. This past summer, we retreated it with Thompson's Water Seal. It's now winter, and we've actually had a cold spell ...
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1answer
115 views

Will pressure-treated lumber shrink enough to cause failure of roof flashing around it?

We need to replace the flat roof on our balcony deck. In the process we also need to replace the balcony deck railing. The salesman for our contractor recommended a wooden railing to match what we ...
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2answers
129 views

Should I put a moisture barrier between a single ply of pressure treated (PT) plywood and a second non-PT ply when constructing a shed?

I am building a shed. The floor consists of 4x4 PT runners, 2x8 PT girders, and 3/4" PT Plywood flooring. Anytime in the past, when I have laid PT lumber next to non-PT lumber, there is mold/...
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1answer
150 views

Galvanized fasteners into exterior concrete - good enough for 20+ years? Or stainless?

Planning to attach pressure treated wood sleepers to a concrete patio and put deck boards over them. I'm trying to decide on what fastener material is best to attach the sleepers to the concrete. This ...
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2answers
2k views

Why is my new pine fence turning black? Can I stain right over it without creating a bigger future headache?

We put in a new pine fence about 2-3 months ago. (Southern Yellow Pine, from Lowes. They called it “Severe Weather Pressure Treated Pine”) I have been trying to stain/seal it for the past month and a ...
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1answer
680 views

White mold or fungus on PT lumber

I'm building a wooden fence and have a number of 4x4 pressure treated lumber stacked neatly in my garage. I've been pulling posts from the stack as I work on the fence over the last 4 weeks. When I ...
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3answers
4k views

Can pressure treated wood be buried in concrete?

I was planning a relatively simple, 6x8ft "2-post" pavilion, just a small structure to provide protection to a small bench. This design would require to bury the wood into the concrete ...
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0answers
106 views

How can I quickly seal wet pressure-treated plywood?

I am replacing the floor in my camper and want to use 3/4" pressure-treated plywood but I want to apply some water sealer before I lay it down. Is there a way I can do this without waiting a lengthy ...
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2answers
166 views

Treehouse ladder - 12ft and corrosion resistant from pressure treated wood?

I'm designing an elevated deck/swingset combo and am trying to figure out how I'm going to build the ladder. But I've got a couple of challenges. One is that the main posts will be ground-contact ...
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1answer
277 views

Can I combine 2x4 lumber to build posts for barn?

Designing a barn/out-building for my off-grid place. Essentially this is an open structure (think of sticks with a roof), but part of which is a shed. The problem is, the longer poles will need to be ...
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1answer
40 views

Painting Pressure Treated Wood | Outdoor Steps Application

I am needing to rebuild some stairs (3 steps), and the previous owner has a great colour scheme going on the house, and I want to maintain that. Now, my wife and I like to do builds/projects that are ...
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1answer
582 views

Is there a test to determine if a nail is galvanized or not?

I bought a nailer which came with some old nails that I'm going to use for a shed floor into pressure treated wood. As you can see, they kinda look galvanized. They have that grey patina. But other ...
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2answers
3k views

Is it normal for pressure-treated lumber to warp?

I recently bought some pressure treated yellow pine for building some window boxes. After building them, I sealed them with a product that would protect the wood for 3-4 years, according to the can. ...
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1answer
273 views

replacing pressure treated 1x4 boards on roof with non-pressure treated white pine - OK?

On an 85 year old house there are pressure treated 1x4s running horizontally across the rafters, and the plywood sheathing is laid on top of those 1x4s. I have to replace some of these 1x4s but there ...
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5answers
9k views

Should bottom wall plates in a basement be treated lumber?

Question for those who are well versed in framing and then maybe some code as well. I got into a discussion the other day between a couple other trades, they were suggesting I was wasting my time ...
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453 views

Can stainless steel or galvinized screws be used indoors on non-pressure treated wood?

I assume yes and there is no harm or downside, besides these screws being more expensive than non-coated screws.
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1k views

Galvanized nails for ACQ treated lumber = must be hot dipped, or not?

We're having some construction done requiring treated soleplates on concrete slab. As such, galvanized nails were used. However, they don't appear to be hot-dipped. My understanding (going back ...
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1answer
912 views

How do I protect the front side of a wood retaining wall?

I have a wood retaining wall made of 3x12 pressure-treated boards similar to the one pictured here. The backside has MiraDrain and 3/4" drainage rock. I have an excess of earth to manage and one ...
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2answers
4k views

Are pressure-treated posts that have been submerged for a few days ruined?

I dug holes for four 8' 4x4 posts, and had the posts positioned and plumbed vertically in the holes, but had to leave for a couple days before I could concrete them in. In the meantime, storms came ...
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2answers
695 views

Will 2x4 remain straight?

I was able to straighten a slightly warped 10-foot piece of pressure-treated wood with clamps. Will it warp again? If so, is there anything I can do so that it doesn’t warp? This 2x4 is being used ...
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1answer
53 views

Best way to make sturdy Fence post for aluminum sign?

I'm looking at putting some posts up for No-Smoking signs at a local club frequented by a couple hundred kids a weekend + their families. One guy recommended Treated lumber, but I heard it'll eat ...
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1answer
1k views

Concrete post base wood too tight

I'm using the Simpson PB66Z "Galvanized Post Base" to attach my pressure treated 6x6 to the footing. The wood seems to be slightly too large to fit such that the bottom of the post rests on the metal. ...
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3answers
68 views

Protect screws in joint and make it look nicer?

So this is what the joint looks like. It's solid, but as you can see, the screws are exposed so they'll be rusting pretty soon. Also, the joint looks horrible. It's PT wood. What can I buy to make ...
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1answer
64 views

Winterizing new wet-treated pressure treated pine deck

We’re in a townhome and replaced our small 2nd floor deck/porch with wet-treated pressure treated pine 3-4 weeks ago. We had to do it well in advance of the other units for safety reasons. There’s a ...
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2answers
124 views

I spend long time in picking lumber. What do you look for when selecting boards?

I typically spend very long time in front of the lumber aisles inspecting boards. Many times I end up not getting anything after all because I thought all boards are imperfect. I see pros spent few ...
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1answer
1k views

How to mate two pressure-treated 2x6s together?

I want to mate two 2x6s pressure-treated boards (span = 8') so that I can use them as a beam for my ground-level floating deck. Should I use a construction adhesive? Anything special given that the ...
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2answers
2k views

Prevent cupping and splitting of wet PT deck boards?

Building a deck now in hot South Carolina. I purchased #1 premium deck boards very nice appearance no knots etc.. The boards are very wet and even though I was sure to put them in the bark up ...
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0answers
51 views

Are there any health concerns around treated wood?

Last weekend I received a pallet of freshly pressure treated (still wet) green Wolmanit feather-edge cladding. I have started to apply it to various buildings. Obviously I am handling it with bare ...
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0answers
927 views

Substitute for Pressure-Treated 2x3

I'm trying to replace a few sections of rotted bottom plate in my basement. I want to use pressure-treated lumber as it will be in contact with the concrete on 2 sides (and it still occasionally gets ...
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0answers
91 views

Department store PT GC lumber

I'm using pressure treated, ground contact lumber like this one bought from Home Depot for an outdoor project in my backyard. Parts of the lumber are buried underground, and some of the buried ends ...
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2answers
3k views

Which wood fence boards will last longer, pressure-treated-lumber or non-treated lumber that has a treatment applied after the fence is built?

I just heard of the capability to build a fence with untreated lumber and to apply a disodium octaborate tetrahydrate solution after installation. The alternatives I have been considering are AWPA ...
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3answers
14k views

Should I use Pressure Treated Wood in a basement?

Home inspector once told me my basement has a slightly high moisture reading. No mold, dampness or musty smell. I am building an entertainment built-in out of lumber and MDF. Should I use pressure ...
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1answer
609 views

Should raw timber be treated for use as in-ground posts?

I've got some grape vines that I need to re-build a badly designed trellis around. Im considering using some felled timber from my back yard. The advantage is that I could use much larger, cheaper ...
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1answer
766 views

how to treat regular lumber for outdoor use

What are the solutions to stain lumber for outdoor use, except buying pressure-treated wood? What I want to do is take the old lumber, which is still in good shape, but turned gray because of the ...
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1answer
531 views

Preserve treated wood?

What should I use, if anything, to preserve these steps made of treated wood? These are on my townhome's back porch. Two of the steps are directly exposed to weather. They were filthy but cleaned up ...
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2answers
2k views

Using pressure-treated wood to make a sandbox

I'd like to build an sandbox for my toddler children. I'd like it to be inexpensive and low-maintenance (no repeated annual sealing of wood, etc.), and it seems that pressure-treated (as opposed to ...
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1answer
2k views

Should I Let my PT Fence Dry Before Installing

I'm installing 300+ LF of fence in the next month or so and am getting ready to start ordering my materials. My main question is should I dry out my PT lumber before installing, posts rails and ...
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1answer
628 views

pressure-treated ramp to storage shed [duplicate]

I am a home owner & have just replaced the sloped ramp to our storage shed with 1/2" PT 2 weeks ago. We live in the Atlanta, GA area so temps have been 90s for highs, with showers frequently. 1) ...
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2answers
94 views

Do I need to treat the ends of PT lumber?

I'm going to be building a retaining box for a gravel pad using 6x6's - 0.16 lb./cu. ft. MCA pressure treated lumber. The dimensions of the box matched up with available lengths at the lumber yard, so ...
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1answer
1k views

Can I use construction screws to pull together bowed joists?

I am building a small (14'x12') detached deck to be placed directly on the ground with some gravel under it. I am using 4x6 pressure treated boards (UC4B) for outside frame. I intend to use 6" ...
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3answers
688 views

Best way to suspend beam end from cable

I'm about to buy hardware for a treehouse project, and am wondering about the best way to attach 3/8' galvanized cables to a 4x10 PT beam. The cables need to be attached near the ends of the beam to ...