Gonna try trex as new bed wood question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**bautino95** · 08-05-2018, 03:11 PM

Hi all. I've done some searches about the trex or composite decking bed wood replacements but have one question I didn't really see addressed in all the old post. The original wood is 3/4" thick right? I cant find composite decking with that thickness. Only a little thinner or thicker and I don't want to mill a whole board down to the right thickness. does it make a big difference if its say 5/8 or 9/16 thick compared to the 3/4 thickness where it sits on the ledge at the front of the bed and at the rear at the tail gate. Hope that makes sense. thanks

BRL · 08-05-2018, 06:12 PM

Yep, you got the right idea IMHO.

Sheet of 3/4" marine plywood here, probably never see an actual bed wood kit again.

Plastic might be even better...how long you plan on living?

...oh yea, I ment to post a picture to give you an idea...duh.

**AussieinNC** · 08-05-2018, 09:11 PM

Look up Armorguard decking....its 3/4" thick by 6" wide.....

Comes in various colors....

Not sure how you intend to secure it...

The bed frame actually twists and moves around, so you cant really thru mount it...

Havent tried using a router to run the standard mount grooves but imagine the plastic would not like it too much....

It all comes down to how much money you want to spend...and how creative you want to be...

Mike C · 08-05-2018, 09:20 PM

I'm going to do the trex in mine as well. I already have it as I got a hookup from a guy I did some work for. $20 for enough to do my bed. I figure i might have to tweak the side rails down onto the shorter boards but the rest of it will snug right up. The stuff I got is gray so it matches my truck as well already. I'm just trying to make up my mind on painted or brushed stainless strips.

FL71C10 · 08-05-2018, 09:23 PM

I have thought about doing that as well but wondered how it would look once you cut the grooves for the bed strips. The protection on Trex board seems to come from plastic skin on them, and it seems like if you cut that groove, it would affect the integrity?

**bautino95** · 08-05-2018, 09:33 PM

I've built decks out of Trex and it cuts like butter. so I was gonna cut the recessed grooves for the hold down strips on my table saw. so its basically being held down just like the factory did. My biggest problem is I have a long bed so my selection of the composite boards are limited to getting 12 foot lengths and cutting them down to 97". then the second problem is the width and thickness I can get in the 12 foot length. I cant find anything in 3/4" thickness. Then out of the above problem I need to either get wider fascia board and rip it down to the correct width, that will let me reuse the hold down bolt holes. or I can get narrower board that are only 5-1/2" wide so I would have to drill new hold down bolt holes. the narrow boards are cheaper by $400 for the whole project. decisions, decisions. thanks

FL71C10 · 08-05-2018, 09:37 PM

yeah, it's expensive. I ended up buying pressure treated boards in longer lengths, and had to get 10" wide boards for the widest ones. 8" boards arent quite wide enough.

I primed the boards with POR15 primer, and then painted them with rustoleum paint. Hard as a rock.

Jim Boy · 08-06-2018, 08:01 AM

How about expansion and contraction in the sun? Just a thought re deck movement. Good luck.

MattPSU · 08-06-2018, 09:59 AM

I used Trex fascia boards. They're a little wider and the color is only on the edged and one face. But we were able to cut & route them just like factory, but we taped them up because the saws would leave marks on them. This is for a custom show truck, so we were extra careful.

We mocked the wood up and it sat for 6 months while the truck was being painted, and some of the wood did twist/warp.

**special-K** · 08-06-2018, 10:34 AM

You could put notches in the Trex to leave 3/4" over the cross supports. There are better products (all poly) in 3/4" like Azek and other cheaper alternatives that are just as good. I only know of t&g in 3/4"

**bautino95** · 08-06-2018, 12:38 PM

MATTPSU- Your truck is kind of what I'm going for, I'm also gonna do the fuel tank relocating to the rear too. I like how you set up your fuel fill. This is my first time taking the bed apart so I have a few other questions that I thought of. If I use s board thinner then 3/4" will it mess up how the wheel wells mount? thanks

08-05-2018, 03:11 PM	#1
bautino95 Active Member Join Date: Feb 2016 Location: vallejo, ca Posts: 147	Gonna try trex as new bed wood question Hi all. I've done some searches about the trex or composite decking bed wood replacements but have one question I didn't really see addressed in all the old post. The original wood is 3/4" thick right? I cant find composite decking with that thickness. Only a little thinner or thicker and I don't want to mill a whole board down to the right thickness. does it make a big difference if its say 5/8 or 9/16 thick compared to the 3/4 thickness where it sits on the ledge at the front of the bed and at the rear at the tail gate. Hope that makes sense. thanks Last edited by bautino95; 08-05-2018 at 04:11 PM.

08-05-2018, 06:12 PM	#2
BRL Registered User Join Date: Jun 2014 Location: Tahuya WA Posts: 510	Re: Gonna try trex as new bed wood question Yep, you got the right idea IMHO. Sheet of 3/4" marine plywood here, probably never see an actual bed wood kit again. Plastic might be even better...how long you plan on living? ...oh yea, I ment to post a picture to give you an idea...duh.

08-05-2018, 09:11 PM	#3
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,155	Re: Gonna try trex as new bed wood question Look up Armorguard decking....its 3/4" thick by 6" wide..... Comes in various colors.... Not sure how you intend to secure it... The bed frame actually twists and moves around, so you cant really thru mount it... Havent tried using a router to run the standard mount grooves but imagine the plastic would not like it too much.... It all comes down to how much money you want to spend...and how creative you want to be...

08-05-2018, 09:20 PM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,709	Re: Gonna try trex as new bed wood question I'm going to do the trex in mine as well. I already have it as I got a hookup from a guy I did some work for. $20 for enough to do my bed. I figure i might have to tweak the side rails down onto the shorter boards but the rest of it will snug right up. The stuff I got is gray so it matches my truck as well already. I'm just trying to make up my mind on painted or brushed stainless strips. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

08-05-2018, 09:23 PM	#5
FL71C10 Registered User Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,506	Re: Gonna try trex as new bed wood question I have thought about doing that as well but wondered how it would look once you cut the grooves for the bed strips. The protection on Trex board seems to come from plastic skin on them, and it seems like if you cut that groove, it would affect the integrity? __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.

08-05-2018, 09:33 PM	#6
bautino95 Active Member Join Date: Feb 2016 Location: vallejo, ca Posts: 147	Re: Gonna try trex as new bed wood question I've built decks out of Trex and it cuts like butter. so I was gonna cut the recessed grooves for the hold down strips on my table saw. so its basically being held down just like the factory did. My biggest problem is I have a long bed so my selection of the composite boards are limited to getting 12 foot lengths and cutting them down to 97". then the second problem is the width and thickness I can get in the 12 foot length. I cant find anything in 3/4" thickness. Then out of the above problem I need to either get wider fascia board and rip it down to the correct width, that will let me reuse the hold down bolt holes. or I can get narrower board that are only 5-1/2" wide so I would have to drill new hold down bolt holes. the narrow boards are cheaper by $400 for the whole project. decisions, decisions. thanks

08-05-2018, 09:37 PM	#7
FL71C10 Registered User Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,506	Re: Gonna try trex as new bed wood question yeah, it's expensive. I ended up buying pressure treated boards in longer lengths, and had to get 10" wide boards for the widest ones. 8" boards arent quite wide enough. I primed the boards with POR15 primer, and then painted them with rustoleum paint. Hard as a rock. __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.

08-06-2018, 08:01 AM	#8
Jim Boy Registered User Join Date: Nov 2017 Location: Wasaga Beach Ontario Canada Posts: 197	Re: Gonna try trex as new bed wood question How about expansion and contraction in the sun? Just a thought re deck movement. Good luck.

08-06-2018, 09:59 AM	#9
MattPSU Registered User Join Date: Nov 2011 Location: Lyman, SC Posts: 734	Re: Gonna try trex as new bed wood question I used Trex fascia boards. They're a little wider and the color is only on the edged and one face. But we were able to cut & route them just like factory, but we taped them up because the saws would leave marks on them. This is for a custom show truck, so we were extra careful. We mocked the wood up and it sat for 6 months while the truck was being painted, and some of the wood did twist/warp. Attached Images __________________ Matt Criswell - Lyman, SC 1972 Chevy Cheyenne SWB - Build: Porterbuilt State 1 Front & Rear, Bolt in Notch, McGaughys 2.5 Drop Spindles, Boyd Welding Fuel Tank UPSTATE SC GM TRUCK CLUB: FACEBOOK WEBSITE

08-06-2018, 10:34 AM	#10
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: Gonna try trex as new bed wood question You could put notches in the Trex to leave 3/4" over the cross supports. There are better products (all poly) in 3/4" like Azek and other cheaper alternatives that are just as good. I only know of t&g in 3/4" __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

08-06-2018, 12:38 PM	#11
bautino95 Active Member Join Date: Feb 2016 Location: vallejo, ca Posts: 147	Re: Gonna try trex as new bed wood question MATTPSU- Your truck is kind of what I'm going for, I'm also gonna do the fuel tank relocating to the rear too. I like how you set up your fuel fill. This is my first time taking the bed apart so I have a few other questions that I thought of. If I use s board thinner then 3/4" will it mess up how the wheel wells mount? thanks



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