Author Topic: gluing trex  (Read 2953 times)

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Offline HowardH

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gluing trex
« on: August 28, 2016, 04:36 PM »
I know there's a few threads out there but not on this exact subject.  I'm building some adirondack chairs out of Trex for durability over wood.  There are a few joints I'd like to glue in addition to using screws.  Would a good construction adhesive work or maybe Gorilla Glue?  These chairs will be sitting outside year round in the Texas heat and cold.  What has worked for you guys?
Howard H
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Offline Peter Halle

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Re: gluing trex
« Reply #1 on: August 28, 2016, 04:43 PM »
Trex is a form of PVC as far as I know.  You can find gel type glues for gluing pvc by Azek or you can even try the plumbing section of the big box store.

Obviously in your situation go with the clear.

Peter
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Offline HowardH

  • Posts: 1064
Re: gluing trex
« Reply #2 on: August 28, 2016, 04:56 PM »
My experience in glueing PVC pipe using that type of glue is there is virtually no open time.  Is that also true with the gel type of glue?  I don't need a lot of time but 30 secs would be nice. 
Howard H
The Dallas Texas Festool Fanatic!

Mark Twain:  "I didn't attend the funeral, but I sent a letter approving of it." "If you tell the truth you don't have to remember anything."

mft1080, Trion, MFT/3, T15, RO150FEQ, TS55, RTS400, CT22, 800, 1080, 1400, 1900 rails, CSX, Vecturo, Qwas dogs, Parf Dogs, Zobo's, Syslite Uni, Kreg router table

Offline roblg3

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Re: gluing trex
« Reply #3 on: August 28, 2016, 05:19 PM »
I use PVC plumbing flue to glue that stuff all the time. If you're worried about open time, line up and clamp your pieces, drill a pilot, apply the glue and the screw hole should be lined up.
Rob Gardner
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Offline T. Ernsberger

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Re: gluing trex
« Reply #4 on: August 28, 2016, 06:16 PM »
I like PL Construction Adhesive that will stick to anything. Its a Polyurethane Construction Adhesive and has great holding power. 

Offline Michael Kellough

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Re: gluing trex
« Reply #5 on: August 28, 2016, 07:41 PM »
Trex is not made of PVC.

The original Trex was a composite of recycled low density polyethylene and sawdust.

The current line of Trex has the same core but now includes a co-extruded "shell".
Trex does not say what the shell is made of. It might be PVC but the core is still ldpe and sawdust.

"In 2009 Trex introduced a ‘Transcend’ line of decking [17] that is a co-extruded composite decking product that includes a shell around the composite boards on three sides to protect the boards from staining, fading and scratching."

Adhesion test results by West System epoxy;

"Different methods of surface preparation are the variables for this test. With the Trex Decking, any surface preparation (including none at all) results in substrate failure, an indication the adhesive and adhesion are adequate for the material. Even with no surface preparation, the surface seems to be rough enough to provide a good grip for the epoxy. "


I don't know anything about the new shell but it looks like this stuff needs to be mechanically fastened. The substrate comes apart too easily if a really good adhesive is used. Maybe a flexible adhesive caulk would work.

Here is a high res photo of a cross section of a Trex Transcend plank. It looks like the shell is still made of PE.

If joining two sections of shell then acrylic, urethane, or adhesive caulk should work fairly well.
« Last Edit: August 28, 2016, 07:55 PM by Michael Kellough »

Offline Sparky

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Re: gluing trex
« Reply #6 on: August 28, 2016, 09:02 PM »
I have glued with gorilla glue and pl premium with good results. Best of all I use the domino too with Sipo tenons and have had great success with mitres staying tight seasons after season.
Ct 36, Ets 150/3, OF1400, Lr32 Set, domino 700 set, hl850, ts 75,Dts 400, kapex

Offline Ptk16

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Re: gluing trex
« Reply #7 on: October 10, 2016, 08:51 AM »
One should be careful gluing miters together on a deck...trex installation guides call for an intentional gap. Depending on your climate, the boards could buckle. Up here in Canada I've seen a joint change size by 1/8" in a matterrible of days.