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Old 09-26-2019, 03:17 PM   #16
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Re: Waterproofing under decking/under porch roof


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Originally Posted by Fisher1871 View Post
26' x 32'

Currently has three steel I-beams (28' in length), evenly spaced. 2"x8"s perpendicular to the I-beams, on top of the I-beams forming the framing for the roof.
Just replacing that doesn't sound unreasonable. Maybe change to 2x10s if you have snow loads or parties on the deck. .
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Old 09-26-2019, 03:26 PM   #17
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Re: Waterproofing under decking/under porch roof


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Just replacing that doesn't sound unreasonable. Maybe change to 2x10s if you have snow loads or parties on the deck. .
To meet the local snow load requirement (city code) I have to either replace the i beams with beefier beams and up grade to 2"x10"s or install engineered wood I-Joists that run parallel to the steel i-beams (26' span).

If I go with the engineered wood beams, the steel i-beams won't be used. I can either pull them or just leave them in place.

Nothing is ever easy...
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Old 09-26-2019, 03:35 PM   #18
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Re: Waterproofing under decking/under porch roof


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Originally Posted by Fisher1871 View Post
To meet the local snow load requirement (city code) I have to either replace the i beams with beefier beams and up grade to 2"x10"s or install engineered wood I-Joists that run parallel to the steel i-beams (26' span).

If I go with the engineered wood beams, the steel i-beams won't be used. I can either pull them or just leave them in place.

Nothing is ever easy...
There no way I would want TGIs that long.,

I would order up the bigger beams with a boom truck so they can be swapped out when delivered. Have the web drilled for ledgers so the joists could go between them and grab some height back.
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Old 09-27-2019, 10:44 AM   #19
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Re: Waterproofing under decking/under porch roof


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Originally Posted by Nealtw View Post
There no way I would want TGIs that long.,

I would order up the bigger beams with a boom truck so they can be swapped out when delivered. Have the web drilled for ledgers so the joists could go between them and grab some height back.
That's a good idea. Still more than I want to get into this year - no way I could get this completed before winter hits.
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Old 09-27-2019, 11:01 AM   #20
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Re: Waterproofing under decking/under porch roof


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That's a good idea. Still more than I want to get into this year - no way I could get this completed before winter hits.
You want to work up a plan for the garage so you can do the deck so they will be easy to join or flash or whatever. It looks like you have enough structure why not just close the deck area in.
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Old 09-27-2019, 11:08 AM   #21
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Re: Waterproofing under decking/under porch roof


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You want to work up a plan for the garage so you can do the deck so they will be easy to join or flash or whatever. It looks like you have enough structure why not just close the deck area in.
True - I contacted a local steel i-beam vendor. see what the cost is.

I reviewed the engineered drawing again. I would not need to upgrade to 2x10s. I can reuse the current 2x8s.

EPDM will be another fun project. haha.
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Old 09-27-2019, 11:23 AM   #22
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Re: Waterproofing under decking/under porch roof


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Originally Posted by Fisher1871 View Post
True - I contacted a local steel i-beam vendor. see what the cost is.

I reviewed the engineered drawing again. I would not need to upgrade to 2x10s. I can reuse the current 2x8s.

EPDM will be another fun project. haha.

This what we do out here but it really isn't DIY friendly and with this and yours the railings should be bolted to the outside not thru the deck.



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Old 09-27-2019, 11:41 AM   #23
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Re: Waterproofing under decking/under porch roof


This isn't bad for 2 people to do.

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Old 10-02-2019, 08:50 AM   #24
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Re: Waterproofing under decking/under porch roof


After much deliberation - I'm going to repair rotten/damaged wood, use 2x8s to frame the area where the back porch was. Install 6x6s as post supports for roof and rubber roof the entire thing. The two 6x6s will penetrate the rubber roof, but with proper sealing/flashing shouldn't leak.

The deck will be framed using the house band board and 6x6 posts, and not touch/rest on the rubber roofing. The deck will be enclosed to discourage anyone from walking out on the rubber roof.

This place will ultimately be a rental (not the original plan). A roof top deck will be a significant chunk of change to build correctly, with no real return on investment. IE - it will not drive an increase in rent.
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Old 10-02-2019, 10:56 AM   #25
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Re: Waterproofing under decking/under porch roof


If rental is planned, why take the trouble and the cost for roof deck? Increases your insurance as well as having to inspect and maintain the railing for the roof deck. A renter who'd actually use the deck (is there privacy?) or pay extra rent may not show.

For the patio, because you have a roof, the flashing under the door is not that critical. Again for the rental, I'd replace the existing posts (for the patio roof) and raise the rails higher than 36" for even more insurance. 44"?

I'm not sure if you are replacing the garage roof or not. Is the replacement due to age or because deck was planned? If replacing, I'd cover with shaped foam boards or add bevel cut 2x to give the roof some slope for drainage. Away from the patio. This depends on if current roof drains well and has no standing pool. EPDM rubber roof may have joint problem. I've no experience here but it looks like the glue joint can fail. Search and make yourself ready for this. Ask the roofer about it during estimate.
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Old 10-04-2019, 10:03 AM   #26
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Re: Waterproofing under decking/under porch roof


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If rental is planned, why take the trouble and the cost for roof deck? Increases your insurance as well as having to inspect and maintain the railing for the roof deck. A renter who'd actually use the deck (is there privacy?) or pay extra rent may not show.

For the patio, because you have a roof, the flashing under the door is not that critical. Again for the rental, I'd replace the existing posts (for the patio roof) and raise the rails higher than 36" for even more insurance. 44"?

I'm not sure if you are replacing the garage roof or not. Is the replacement due to age or because deck was planned? If replacing, I'd cover with shaped foam boards or add bevel cut 2x to give the roof some slope for drainage. Away from the patio. This depends on if current roof drains well and has no standing pool. EPDM rubber roof may have joint problem. I've no experience here but it looks like the glue joint can fail. Search and make yourself ready for this. Ask the roofer about it during estimate.
This is pretty much it.

I have to install at least a small deck/porch due to an exterior door from the kitchen opening up to the garage roof. I'm not going to install a deck on the entire garage roof (which does need replaced due to poor construction originally and lots of rot currently). The new floating deck will be like 10x7, with a set of stairs to ground level.
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Old 10-18-2019, 09:26 AM   #27
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Re: Waterproofing under decking/under porch roof


I've decided to go in a whole different direction.

I'm going to remove the garage entirely. After running the numbers and looking a different options, due to the poor initial design and construction of the garage, it does not make sense to spend the money to put a roof on it.
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