Building A Patio Overhang Structure

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May 30, 2022
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Location
Torrance, CA
I'm waiting on a quote from a local builder, but it's already leaning towards a LOT of money. Thinking I may have a go myself.

Thinking pressure treated lumber. Semi clear panels for the roof; need light to come through. The old panels are fiberglass, but checking places like Lowe's, suggests polyurethane is better? Anyway, if anyone has wisdom to share, please do so!
 
Check with a builder supply on the panels. They mostly deal with pros that know what they want so don't expect to play 20 questions at a builder supply store.
 
Within the hour, after posting this, the contract dude came back with a fair quote. I've got my Lowe's cart loaded with supplies, but now, it's not needed. Paying more than DYI, but that's okay.

Builder dude said the poly panels are good. More durable than fiberglass.

Another big check to be signed, but I knew this was coming, so it's okay.
 
You probably mean polycarbonate roof panels? I agree with skyactive - talk to local builders to find the best product for your climate (UV resistant, etc.). Polycarbonate requires you follow protocol for expansion/contraction, etc..
 
What is the warranty on poly or plastic panels? They tend to warp over time in the heat. Look pretty poor in a few years.
 
What is the warranty on poly or plastic panels? They tend to warp over time in the heat. Look pretty poor in a few years.
So, fiberglass is better? That's what's up there now. Thinking they must be 40 years old, or more.
 
So, fiberglass is better? That's what's up there now. Thinking they must be 40 years old, or more.
If you have some that have lasted 40 plus, why not use the same thing again? At least keep that option on the table.

Plastic (poly) dries out, fades and warps. Not an enduring product in my book.
 
Looks like the polyurethane panels have a 15 year warranty. I'll do some more research, but many construction supply houses don't even stock the fiberglass stuff anymore.

I'm having the area with the white walls closed in properly, and converted into a laundry room. Currently, the washing machine is in the kitchen, and the drier on that porch. This house was built before laundry rooms were standard construction. Also, adding a utility sink.

Screenshot 2025-09-25 074252.webp
 
Polycarbonate panels, not polyurethane like I've stated above. Sorry...

Construction crew starting tomorrow (hopefully). Think I'm over paying a little, but builder dude is the friend of a friend, and comes highly recommended. It's all coming together pretty fast, too, which is nice.

The patio overhang is pretty straight forward. Bigger task is building the laundry room. I've been living with the laundry setup like the previous owner had it. The gas drier is on that porch area, fed by a galvanized gas line laying on top of the concrete slab. Extension cord feeding the drier from across the room. Getting a proper gas line and electrical installed, and plumbing too, of course.

Once this project is done, I'll be making new fences. This time, I'm doing it myself. Gotta save a few bucks. I've been spending like a drunk sailor on this house lately, and that's gotta stop.
 
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Making progress. The "laundry room" is framed in. Some rot on the roof joists, where the fascia attaches. Builder said this occurred, in part, because the old pergola was mounted under the soffit, and moisture and crud was trapped in the space. Rot is being removed, and doublers added to the roof joists. The new pergola will mount to the edge of the roof, not under the soffit like before.

Screenshot 2025-10-03 093401.webp
 
The pergola should be done today. One thing I didn't know, namely that the metal joist reinforcement straps are added after the structure is built. Doing it this way allows each hanger to be tightly fit around each joist.

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I'm waiting on a quote from a local builder, but it's already leaning towards a LOT of money. Thinking I may have a go myself.

Thinking pressure treated lumber. Semi clear panels for the roof; need light to come through. The old panels are fiberglass, but checking places like Lowe's, suggests polyurethane is better? Anyway, if anyone has wisdom to share, please do so!
Can you go with Trex decking vs real lumber? Depending on the lumber prices Trex or equivalent can be less per square foot than lumber but has a 30 year lifespan and doesn't require yearly treatment.
 
Can you go with Trex decking vs real lumber? Depending on the lumber prices Trex or equivalent can be less per square foot than lumber but has a 30 year lifespan and doesn't require yearly treatment.
Fair suggestion, but the ship has sailed. As mentioned, the pergola is almost done. I'm really happy with the results.

The dark finish on the pressure treated wood looks somewhat similar to the aged redwood of the old pergola. My son looked at the new structure, and said, "it looks just like the old one". Ha ha. One big difference, this one isn't going to fall down the next time the wind blows!
 
Plumbing for the laundry. Didn't want to try to run everything inside the wall, because electrical panel and a couple of big 4x4's support the wall on that corner.

Today, electrical, and drywall. Will stuff insulation in everywhere that can be reached. As you can see, there is nothing in old the walls currently. So goes it with an old house.

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