Tongue and groove ceiling layouts and install suggestions

mike93lx · May 6, 2026

I think I've decided to to a T&G pine ceiling in my pool shed. Prefinished 1x8 will be about $500 and this will give me some practice for a screen room an front porch that I'd like to do with the same material.

The ceiling is a 15'1" square and the 24OC trusses run left to right as you enter the building. I'd like to do something more interesting (and challenging) than just running it perpendicular.

I'll have four can lights and a centered ceiling fan. Being a square and having something at the center makes me want to try a pattern like this.

I know the center would need some blocking, but should I strap the whole ceiling at 16OC, plus the diagonals?

I was thinking to use my 16 gauge nailer for 2" nails.

Any tips or ideas?

PCustoms · May 6, 2026

mike93lx said:
I think I've decided to to a T&G pine ceiling in my pool shed. Prefinished 1x8 will be about $500 and this will give me some practice for a screen room an front porch that I'd like to do with the same material.

The ceiling is a 15'1" square and the 24OC trusses run left to right as you enter the building. I'd like to do something more interesting (and challenging) than just running it perpendicular.

I'll have four can lights and a centered ceiling fan. Being a square and having something at the center makes me want to try a pattern like this.

I know the center would need some blocking, but should I strap the whole ceiling at 16OC, plus the diagonals?

I was thinking to use my 16 gauge nailer for 2" nails.

Any tips or ideas?

I'm not seeing how strapping is going to work for that layout, I'd bet it is solid backed with plywood or perhaps OSB.

Or are you saying strap 4 segments?

mike93lx · May 6, 2026

PCustoms said:
I'm not seeing how strapping is going to work for that layout, I'd bet it is solid backed with plywood or perhaps OSB.

I'm thinking strapping running perpendicular and tighter spacing. Why wouldn't it work except on the pieces too short to span between them?

No different than decking laid on a diagonal

Burt Shaver · May 6, 2026

Some of this T and groove is ultra thin, I’m wondering if you even need to strap it? No insulation adding weight. If you run into a spot that you need something to fasten to you can always add some blocking flush between the trusses or sister a piece of 2x4 to the side of the truss, that’s if you even run into that situation. Since it’s t n g as long as the fateners hold it to the ceiling there will not be any sag. As you mentioned you will need to add some blocking fo the ceiling fan first and maybe block in where the pot lights are going to go to make that area more ridgid, doesn’t have to be tight, even blocking within 3 to 6 inches of the pot lights would be more than enough, no weight to them.

PCustoms · May 6, 2026

mike93lx said:
I'm thinking strapping running perpendicular and tighter spacing. Why wouldn't it work except on the pieces too short to span between them?

No different than decking laid on a diagonal

Won't half your strapping be parallel to the planks?

mike93lx · May 6, 2026

PCustoms said:
Won't half your strapping be parallel to the planks?

Based on the Pic, no. But I think my comment of doing the diagonals may have confused it.

If I want the joints to align on the diagonals, the strapping would need two layouts, yes.

mike93lx · May 6, 2026

Burt Shaver said:
Some of this T and groove is ultra thin, I’m wondering if you even need to strap it? No insulation adding weight. If you run into a spot that you need something to fasten to you can always add some blocking flush between the trusses or sister a piece of 2x4 to the side of the truss, that’s if you even run into that situation. Since it’s t n g as long as the fateners hold it to the ceiling there will not be any sag. As you mentioned you will need to add some blocking fo the ceiling fan first and maybe block in where the pot lights are going to go to make that area more ridgid, doesn’t have to be tight, even blocking within 3 to 6 inches of the pot lights would be more than enough, no weight to them.

I will be insulating, but using faced, stapled to the trusses, and no blown in on top. So that won't add much weight.

The "cans" are the wafers, so they probably weigh about as much as the wood that I'll cut for the hole

mike93lx · May 6, 2026

What molding should I use for the diagonal joint? A T profile or just something like 1/4" thick by 1" wide?

Burt Shaver · May 6, 2026

Just looking at my ceiling and trying to picture the job, may be easier to just go ahead and strap it, otherwise I’m thinking you would need to install blocking around the perimeter, lots of cutting and fitting so not much fun.

Burt Shaver · May 6, 2026

For the joint I would just use some flat stock, the narrower the better to show off the precision while installing the t n g. Don’t forget to run a chalk line on those diagonal joints. Don’t want to get done and realize it wasn’t straight as an arrow

strutaeng · May 6, 2026

Can probably do a "2-way" strapping? 1x strapping running in one direction, with a second set running perpendicular at the same depth (fastened with pocket screws).

But plywood could be faster, then you can nail wherever. I would probably do something like 19/32" or thicker for good nail-holding power.

jar944 · May 6, 2026

I'm not a fan of any mouldings over the miters.

Tight miters save lives, even on a vault/arch

y'sguy · May 6, 2026

I've done it years ago at my previous home. Ordered cedar, longer lengths, which you should not need. Prefinished everything. Lots and lots of waste, and mine WAS running length of the room. Even though I ordered a high grade of cedar there were still pieces that were not able to be used and some that I did use, they really needed to be coerced into position. Those had to fastened with good phillips head screws. I choose to never do it again.

But it did turn out well.

Burt Shaver · May 6, 2026

Am I correct in thinking you have a flat ceiling with bottom chords of trusses all running the same way? You want to install t n g pine in 4 triangles basically so the t n g will always be running at a 45 degree angle from the bottom chords? If this is the case and you strapped the ceiling perpendicular to the ceiling joists you would be running the pine on a 45 from the strapping all the time. If this is the case I would see no need for a solid backer

readhead · May 6, 2026

Is the pre finished material 3/4”?

Burt Shaver · May 6, 2026

I would also run a line or laser every 4 to 6 courses to make sure you are not running off straight. What I mean is forcing the tongue into the groove further on one end than the other and installing not straight.

mike93lx · May 6, 2026

jar944 said:
I'm not a fan of any mouldings over the miters.

Tight miters save lives, even on a vault/arch

I really appreciate that you think I can achieve that

mike93lx · May 6, 2026

Burt Shaver said:
Am I correct in thinking you have a flat ceiling with bottom chords of trusses all running the same way? You want to install t n g pine in 4 triangles basically so the t n g will always be running at a 45 degree angle from the bottom chords? If this is the case and you strapped the ceiling perpendicular to the ceiling joists you would be running the pine on a 45 from the strapping all the time. If this is the case I would see no need for a solid backer

Yes, flat bottom chord

mike93lx · May 6, 2026

readhead said:
Is the pre finished material 3/4”?

It's listed as 1x8, so I'd take that to mean 3/4"

mike93lx · May 6, 2026

strutaeng said:
Can probably do a "2-way" strapping? 1x strapping running in one direction, with a second set running perpendicular at the same depth (fastened with pocket screws).

But plywood could be faster, then you can nail wherever. I would probably do something like 19/32" or thicker for good nail-holding power.

I'd do plywood before that 2 way strapping setup, but I'd prefer to avoid plywood for this due to cost. I really should be able to do tongue and groove without needing complete backing.

It would be a different story if I was doing something like herringbone, though

readhead · May 6, 2026

Back in my trim carpenter days I did a lot of T&G. Took a lot out and put a lot in. One of the advantages of T&G is the ability to land the joints anywhere. When I rehabbed the Telluride Depot I would guess that maybe 30% of the joints landed on a stud or joist. One issue you might have is not being able to sand the joints because it is pre-finished. I don’t see a need for strapping. You will need to have some solid backing where the 45 joints land. Tight 45’s will always look better than some kind of trim.

PCustoms · May 6, 2026

mike93lx said:
Based on the Pic, no. But I think my comment of doing the diagonals may have confused it.

If I want the joints to align on the diagonals, the strapping would need two layouts, yes.

Yeah, I see it now.

I did 24" O.C. strapping perpendicular to the 1x6, with a bad of adhesive as I put it up. 90% sure I primed the backside, still got slight cupping in spots.

YMMV

readhead · May 6, 2026

Your longest board will be 10’-8”. What is the longest length you can get? Joints in such a small space are not going to look good.

mike93lx · May 6, 2026

readhead said:
Your longest board will be 10’-8”. What is the longest length you can get? Joints in such a small space are not going to look good.

I believe the listing said 16'.

If I do this layout, I'll list out the dimensions needed and confirm sizing with the supplier to hit the right sizes

BigMike782 · May 6, 2026

From putting 1x4 beaded ceiling in my living room long ago

.......make sure that every board is the same pattern.
Yup, I have one stinkin piece that was ever so slightly different on the T&G fit. After all these years I can see it but no one else has ever noticed.

larry4406 · May 6, 2026

At the day job, we sometimes do decorator ceilings interior to the home.

When we use an engineered finished wood floor, we install 3/4" T&G subfloor to the ceiling joists/trusses. Then we apply the flooring. The flooring vendor insisted on the subfloor nailing substrate.

The same house we did a different decorator treatment using shiplap and faux oak beams in the master bedroom. Here, the trim carpenter decided to glue and nail the shiplap to the drywalled ceiling. Electrician left hang wires so we could shift them as needed to course out properly. All went fine, except since the room was rectangular and not square, this means that the mitered end cuts are not 45 degrees! Well, as the install fanned out, this error became apparent! So we shrunk the bulkheads to hide the error! Then 2x6's were nailed to the shiplap and framing to support the mitered edge oak beams.

mike93lx · May 6, 2026

larry4406 said:
At the day job, we sometimes do decorator ceilings interior to the home.

When we use an engineered finished wood floor, we install 3/4" T&G subfloor to the ceiling joists/trusses. Then we apply the flooring. The flooring vendor insisted on the subfloor nailing substrate.

The same house we did a different decorator treatment using shiplap and faux oak beams in the master bedroom. Here, the trim carpenter decided to glue and nail the shiplap to the drywalled ceiling. Electrician left hang wires so we could shift them as needed to course out properly. All went fine, except since the room was rectangular and not square, this means that the mitered end cuts are not 45 degrees! Well, as the install fanned out, this error became apparent! So we shrunk the bulkheads to hide the error! Then 2x6's were nailed to the shiplap and framing to support the mitered edge oak beams.

That's exactly what I expect my pool shed to look like

billconner · May 6, 2026

See pic but I like and found easier the hearing bone pattern. Set a router with slot cutter and it was surprisingly easy. I used 1x4 during on diagonals and 1x3 16" on center perpendicular to straights.

This is 1x6 edge and center bead. I bought it unfinished and found it easy to finish both sides. Built a racking system that was inspired by accident. I had more sq ft but it was like a 1/3 the cost of pre finished.

Just some thoughts from someone who did it recently.

ps - blind nailed with 16 guage nailer - 1 3/4"

larry4406 · May 6, 2026

mike93lx said:
That's exactly what I expect my pool shed to look like

That master ceiling was a royal PIA. Don't want to do it again. But I know how now!

I have done some other porches with stained T&G. They used mono trusses and customer wanted the boards run parallel to the trusses.

We installed perpendicular bracing every 16" on center between the trusses and full blocking around the perimeter. We measured a thousand ways to Sunday. Ultimately, we started at the dead center with a full board and ran wild to the ends. Used a spline at the center to do the *** change on the boards. Worked out well as I had a crew installing left while another went right. Lights and speakers were mudrings that we routed to match and snapped in. Customer also had us install 240V infrared heat lamps that crank!

mike93lx · May 6, 2026

larry4406 said:
That master ceiling was a royal PIA. Don't want to do it again. But I know how now!

I have done some other porches with stained T&G. They used mono trusses and customer wanted the boards run parallel to the trusses.

We installed perpendicular bracing every 16" on center between the trusses and full blocking around the perimeter. We measured a thousand ways to Sunday. Ultimately, we started at the dead center with a full board and ran wild to the ends. Used a spline at the center to do the *** change on the boards. Worked out well as I had a crew installing left while another went right. Lights and speakers were mudrings that we routed to match and snapped in. Customer also had us install 240V infrared heat lamps that crank!

Want to swing by the weekend of the 16th?

PCustoms · May 6, 2026

mike93lx said:
Want to swing by the weekend of the 16th?

Can I fly with a nail gun?

larry4406 · May 6, 2026

mike93lx said:
Want to swing by the weekend of the 16th?

What and supervise?

mike93lx · May 6, 2026

PCustoms said:
Can I fly with a nail gun?

Yes! I'll pick you up at ~~lockup~~ the airport

mike93lx · May 6, 2026

billconner said:
See pic but I like and found easier the hearing bone pattern. Set a router with slot cutter and it was surprisingly easy. I used 1x4 during on diagonals and 1x3 16" on center perpendicular to straights.

This is 1x6 edge and center bead. I bought it unfinished and found it easy to finish both sides. Built a racking system that was inspired by accident. I had more sq ft but it was like a 1/3 the cost of pre finished.

Just some thoughts from someone who did it recently.

ps - blind nailed with 16 guage nailer - 1 3/4"

Looks awesome Bill.

I'm happy enough with the cost of prefinished and have so little time for projects that I need to pay the premium, whatever it is.

peternguyen · May 6, 2026

For a 15' diagonal layout, strapping gets fiddly. Half your strapping ends up running parallel to the planks unless you do two grids. Easier route: 1/2 sheathing ply screwed to the trusses, then nail the T&G wherever you want. No spacing math. Did this on a covered porch ceiling for a buyer in Texas a couple summers back, cost was within $30 of proper strapping once you factored labor and the diagonal cuts. Prefinished 1x8 pine with no insulation isnt heavy. 7/16 sheathing ply handles it fine, the planks add their own stiffness once they tongue together.

mike93lx · May 6, 2026

peternguyen said:
For a 15' diagonal layout, strapping gets fiddly. Half your strapping ends up running parallel to the planks unless you do two grids. Easier route: 1/2 sheathing ply screwed to the trusses, then nail the T&G wherever you want. No spacing math. Did this on a covered porch ceiling for a buyer in Texas a couple summers back, cost was within $30 of proper strapping once you factored labor and the diagonal cuts. Prefinished 1x8 pine with no insulation isnt heavy. 7/16 sheathing ply handles it fine, the planks add their own stiffness once they tongue together.

Picture the layout rotated 45 degrees. So every board is on an angle

Oregon rock crusher · May 7, 2026

An easy way to cut all the boards for that type of ceiling design is to make a simple A shaped jig at the angle you want. 90* for a four sided or say 45* for eight like I used. Just stack all the boards on a cutting surface and lay the jig on top. Makes it easy to use up shorts on top of the jig and even 45* joints on the longs end up looking good.

When all boards are layed out face down and secured throw the jig on top with one of the cross braces aligned with a joint. Take any good circular saw set to exactly 45* angle on the blade and just saw from up both jig sides. on final assembly the joints will virtually disappear. All the boards will end up the right length with every board aligned. If you want, you can then preassemble all pieces on the floor and lay out all of the edge cuts or, with a little more measuring, go up one section at a time. It makes the job go really fast. Ed.

tarbellb · May 7, 2026

I would substrate the whole area with 7/16" osb, lets you shoot a nail anywhere you want to keep things tidy

Otherwise you are marking the walls running string lines or lasers all day
--

No strapping.... go for clean miters and if needed you can go back and nail a trim piece over the joints

NICE work @larry4406, appreciate the photos

mike93lx · May 7, 2026

tarbellb said:
I would substrate the whole area with 7/16" osb, lets you shoot a nail anywhere you want to keep things tidy

Otherwise you are marking the walls running string lines or lasers all day
--

No strapping.... go for clean miters and if needed you can go back and nail a trim piece over the joints

NICE work @larry4406, appreciate the photos

Do you really think 7/16 will hold trim nails well enough over time? Feels very thin.

I really don't want to sheathe this ceiling even if it makes the install slower.

peternguyen · May 7, 2026

yeah that's exactly when strapping breaks down. Doesnt matter what angle the planks run, sheathing ply over the trusses gives full nailing surface anywhere. Saw a guy do diamonds running 45 in a Phoenix sunroom last year, just 7/16 ply and a brad nailer.

Tongue and groove ceiling layouts and install suggestions

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