Question about deck rail post hardware. - Woodworking Talk - Woodworkers Forum
 
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post #1 of 11 Old 04-02-2020, 09:59 PM Thread Starter
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Question about deck rail post hardware.

Hi, All!
I’m a pretty new framer, just 2 years in and have a question regarding 4by4 deck railing on a flat deck roof(my property). I was trying to avoid cutting into the roof to put in the posts and instead notching them and bolting them to the side, in through the header joist. What would be the best hardware? do I have to run Through bolts with nuts on the inside or can I use a trulok type screw? I’d rather use through bolts for more support but do I have to flash it or would caulking be sufficient seeing that it’s exposed to weather(rain/snow) Thanks. Seems like a basic question but I’m not a roofer and I haven’t dealt with a deck roof yet.
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post #2 of 11 Old 04-02-2020, 10:09 PM Thread Starter
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A picture of the deck roof
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File Type: jpg CF690EE5-83C5-4812-9686-BC736470FD30_1585879715592.jpg (532.9 KB, 21 views)
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post #3 of 11 Old 04-03-2020, 12:03 AM
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Batman,
Im no roofer but I was a home inspector for 15 years. The modified bitumen membrane in your picture is not supposed to be a walking surface.
You must ad a strips of roofing membrane where the decks joists will be contacting the roof. The 4x4 posts should be attached to the band joists with through bolts and Simpson Strong Tie deck tension ties (DTT) or similar.

Not sure how youd attach the deck to the wall or roof without creating possible avenues for moisture intrusion.

Best of luck,


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post #4 of 11 Old 04-03-2020, 03:13 AM Thread Starter
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Hey thanks for responding.
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post #5 of 11 Old 04-03-2020, 06:43 AM
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You are making a big mistake by even thinking of doing what you are planning. As said above, there is probably no way to accomplish this without exposing your house to moisture intrusion. Flat roofs especially are bad.


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post #6 of 11 Old 04-03-2020, 06:48 AM
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I would be tempted to use some fittings as used on boats and in Stainless. Any rust would give rise to unsightly streaks.
I would also not have a long run between supports to avoid any of Hollywood style accidents from guests falling against rail. My son used to climb out of his bedroom window onto a flat roof. Only found out when neighbour thought he was a burglar.
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post #7 of 11 Old 04-03-2020, 02:50 PM
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Why don't you build a new deck that will sit on top of the roof, that way you're not walking on the roof. Build it like you would a new floor with 2X10 around the outside and the joists all in proper hangers attached to the rim joists. This way the new deck joists transfer the weight load to the edges so that the weight is put on the outside walls of the room below where it belongs instead of on the ceiling joists of the room below.

Then attach your railing posts to the new deck, that way you're not doing anything that would allow moisture into your house.

You should end up with a completely floating deck that a helicopter could pick up and lift off the roof.
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post #8 of 11 Old 04-03-2020, 03:24 PM Thread Starter
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It seems strange the person that built the deck didn’t put in posts to begin with and get them flashed when the roofing material was put on, seeing that it was made to be a operational deck. I’d love to build a raised deck on top but there’s slider doors going out on to it at level already.
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post #9 of 11 Old 04-03-2020, 06:24 PM
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You could pull the flashing off the building, put the railing up then re-flash it.

None of the good, permanent, solutions will be easy IMHO.

My 2 cents is that if you try to cheat your way through this with a caulking gun and a prayer you're going to feel like a foolish-failure a few years from now if you get water ingress and mold in that lower room.

Then again, it's your house, do whatever you think will work.
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post #10 of 11 Old 04-03-2020, 09:33 PM Thread Starter
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I certainly don’t want to wing it with Just caulking. If I do end up doing it, I’d be ok with taking the time to flash it. It would be a little tricky to flash due them being notched and bolted to the side.
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post #11 of 11 Old 04-03-2020, 10:03 PM Thread Starter
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What if I build a raised railing system, similar to a whole raised floating deck. But because of budget I might just do a raised perimeter, tying into the house instead. That way I’m not going into the roof at all. If possible.
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