Composite deck


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Old 09-17-22, 04:59 AM
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Composite deck

I'm replacing PT deck boards with composite in a few weeks. Temps will probably be in the 50s when I install them. How much do composite deck boards expand/contract with temp and do I need to gap the board more than what the fastening clips provide?
 
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Old 09-17-22, 05:15 AM
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I have never done anything differently due to temperature.
 
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Old 09-17-22, 05:18 AM
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Composite is not effected by temps or weather. If using invisible clips everything is snugged up!

Great decision, you will never regret having made that decision. my 14 year old deck still looks as good as the day it was installed.
 
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Old 09-17-22, 05:53 AM
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Only drawback is it's expensive. But will pay for itself over the long haul.
I would not use vinyl or composite on fencing, however.
 
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Old 09-17-22, 01:42 PM
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The deck boards are expensive but I expected that. It's the cost of the other stuff that surprised me. Fascia boards at $125 for a 12' board, $300 plus for hidden fasteners plus posts, caps, rails and spindles. Originally my intention was to use Trex Transcend composite rail sections w/new PT posts. But at nearly $300 per rail section I am rethinking that. I may reuse the turned PT spindles that I now have with new PT rails and posts. Or I may look for a different brand of rail sections. I'm 77 so I'm not especially concerned with longevity.

Any preference for deck board fasteners? I prefer hidden and I am looking at either the Trex style or the Camo edge clip.
 
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Old 09-17-22, 03:14 PM
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Fasteners are largely personal preference unless the manufacturer requires a certain practice.

Some depends on the decking you choose, (if using grooved planks they need to fit the profile) but generally if using Trex, the Trex Hideaway fastener is fine for the field, Trex or Camo edge clips for the edges, Cortex screws and plugs for places you can't use blind fasteners... sometimes Deckmaster Grabber kits are useful instead of face drilling.

 
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Old 09-22-22, 12:33 PM
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This is my first time using composite so I'll probably have even more questions. I have built a couple of decks in the past but have always used PT wood. My existing deck that I'm renovating is 20'X16 and just under 5' off the ground. I'm rebuilding because I'm tired of staining and painting and this summer I found half of the PT bottom rails were rotting.
I am using composite boards for steps. I have 5 stringers 16" OC with two 2X8 for 15" treads. If I switch to composite boards for the treads I haven't figured out how to make up the difference in tread thickness. I don't want to cut new stringers. Are spacers on the stringer acceptable or is there another way to make up 1/2"?
My plan is to rip the groove off the outer composite board and ease the cut edge with a router. That way I can install the riser under the tread nose to avoid that exposed seam. If the deck board treads are spongy is blocking (2X4 on edge) acceptable for stiffening a tread.
My last head scratcher is covering the exposed ends of the deck boards so I don't have to see the ugly grooves on the underside. My plan is to allow the boards to overhang the rim joist a couple of inches and then install fascia butted under the overhang. That doesn't cover the underside.
Last question - I'm submitting the permit application next week. I built this deck almost 40 years ago and I know code has changed. At the time I installed 4X4 PT posts through bolted to outside of the rim joist cutting the 4X4 post to overlap the joist. My understanding is that the code has changed and that joint is not acceptable. Is that correct
 
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Old 09-22-22, 04:51 PM
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My last head scratcher is covering the exposed ends of the deck boards so I don't have to see the ugly grooves on the underside. My plan is to allow the boards to overhang the rim joist a couple of inches and then install fascia butted under the overhang.
Cut them flush and use fascia boards to cover the rim and the deck!
 
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Old 09-22-22, 04:53 PM
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I'm submitting the permit application next week. I built this deck almost 40 years ago and I know code has changed. At the time I installed 4X4 PT posts through bolted to outside of the rim joist cutting the 4X4 post to overlap the joist. My understanding is that the code has changed and that joint is not acceptable.


May be a fine line, but your not building the structure your replacing the deck, IMO a permit is not needed!
 
 

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