Covered Pergola

mloc123 · 04-03-2021 01:23PM #1

Has anyone ever built a covered pergola using twinwall polly?

How did it turn out and how well did the polly age? I always assume it will discolour and go green... generally look pretty crap after a few years.

karlitob · 04-03-2021 01:53PM

mloc123 wrote: »

Has anyone ever built a covered pergola using twinwall polly?

How did it turn out and how well did the polly age? I always assume it will discolour and go green... generally look pretty crap after a few years.

Neighbour has it. Looks ****e.

MayoForSam · 04-03-2021 09:09PM

I'm building one right now beside our house, I'm going with clear corrugated perspex for the roof, less liable to discolor compared to TW PC and will let in more light. I can always replace the sheets in a few years if they begin to show signs of wear and tear or even remove them completely if our summers start to improve

mloc123 · 04-03-2021 10:12PM

MayoForSam wrote: »

remove them completely if our summers start to improve

:pac:

Interested in seeing some pics if you upload them along the way

An Ri rua · 04-03-2021 10:21PM

Our homeplace had the plastic and while it worked well for years, they had climbing roses growing up and that has started to bulge the plastic, resulting in pooling water.
I'd definitely go perspex as we will be replacing shortly.

fred funk }{ · 05-03-2021 04:28PM

An Ri rua wrote: »

Our homeplace had the plastic and while it worked well for years, they had climbing roses growing up and that has started to bulge the plastic, resulting in pooling water.
I'd definitely go perspex as we will be replacing shortly.

I've just finished one here at home. I went for 16mm triple wall polycarbonate for some extra strength and for the extra €100 I think it was worth it.

fred funk }{ · 05-03-2021 04:34PM

Here's a picture

listermint · 05-03-2021 04:36PM

Genuinely why not glass . I think the prices are probably comparibble but one product offering far longer life and transparency.

fred funk }{ · 05-03-2021 04:43PM

listermint wrote: »

Genuinely why not glass . I think the prices are probably comparibble but one product offering far longer life and transparency.

For me it was ease of installation. I put the roof on pretty much on my own and could take it down in no time to replace if needed.

mloc123 · 05-03-2021 07:51PM

fred funk }{ wrote: »

Here's a picture

My other question is... Does it block much light coming into you back room?

Fine Cheers · 05-03-2021 07:54PM

Just finished a lean-to and put clear solid polycarbonate sheets on it. We have debated the options here on several threads. Solid poly not cheap but simple to install. Not that easy to get up in place (3m x 2m sheet) but sheets can be ordered cut to size. Check out Dave on TodayFM who did a pergola at back of house and posted a lot of photos and videos on Insta. I went with the solid purely for aesthetics.

mloc123 · 05-03-2021 08:03PM

DIY KING wrote: »

Just finished a lean-to and put clear solid polycarbonate sheets on it. We have debated the options here on several threads. Solid poly not cheap but simple to install. Not that easy to get up in place (3m x 2m sheet) but sheets can be ordered cut to size. Check out Dave on TodayFM who did a pergola at back of house and posted a lot of photos and videos on Insta. I went with the solid purely for aesthetics.

Any links to suppliers... Or a ballpark figure?

fred funk }{ · 05-03-2021 08:36PM

mloc123 wrote: »

My other question is... Does it block much light coming into you back room?

I was really concerned about blocking light but I can safely say there's very little difference.

I put lights front and back of each post and at night they brighten up that whole area.

fred funk }{ · 05-03-2021 08:42PM

mloc123 wrote: »

Any links to suppliers... Or a ballpark figure?

I bought mine from goldstarplastics and found them the cheapest around. I paid about €500 delivered for 16mm triple wall clear. 2 sheets of 2.1m wide x 2.3 fall.

Fine Cheers · 05-03-2021 09:07PM

365 Plastics Ashbourne or Print Solutions Dublin. I used the latter who I found very helpful sent me small samples to help decide. Both supply the multiwall and all accessories. Both have decent websites.
And remember YouTube is your friend.

Cerco · 05-03-2021 11:24PM

Did you build this from scratch or were you able to get the timbers cut and ready for assembly?
Looks impressive.

Fine Cheers · 06-03-2021 12:54AM

Nice project there in pic.
You'll buy standard lengths from your local builders providers and cut yourself to suit.

06-03-2021 01:01AM

Are the uprights 6” ?

fred funk }{ · 06-03-2021 10:51AM

[Deleted User] wrote: »

Are the uprights 6” ?

Yes. Think they were 8ft lengths.

fred funk }{ · 06-03-2021 10:52AM

DIY KING wrote: »

365 Plastics Ashbourne or Print Solutions Dublin. I used the latter who I found very helpful sent me small samples to help decide. Both supply the multiwall and all accessories. Both have decent websites.
And remember YouTube is your friend.

Find them more expensive than goldstar.

06-03-2021 10:55AM

fred funk }{ wrote: »

Yes. Think they were 8ft lengths.

Brilliant, looks exactly like a project I’m planning for. Mind if I ask how you attached it to the wall of the house?

fred funk }{ · 06-03-2021 11:30AM

[Deleted User] wrote: »

Brilliant, looks exactly like a project I’m planning for. Mind if I ask how you attached it to the wall of the house?

Bolted a 7 x 2 to the house and the 4x2 rafters on joist hangers. I'll stick up more pics later.

I'm not a professional so its s DIY job so I'm sure I haven't done everything perfectly.

06-03-2021 12:19PM

Oh I’m definitely not a professional either!! Joist hangers is what I was looking at doing alright…

Care to put a ballpark cost on the timber? I assume you didn’t get it in Woodies or similar!

fred funk }{ · 06-03-2021 12:36PM

Think the timber was about €250 but found a big variation in prices so shop around. I got mine from wood industries in rathdrum in wicklow.

Price also included the 3 shoes for the posts.

Another thing, I bought a self levelling laser and I couldn't recommend it enough. Made the job so much easier.

Cerco · 06-03-2021 02:52PM

Two more questions if I may:
Is the timber pressure treated?
Did you need any flashing at the back wall?

fred funk }{ · 06-03-2021 03:23PM

Cerco wrote: »

Two more questions if I may:
Is the timber pressure treated?
Did you need any flashing at the back wall?

Yes, pressure treated and cut ends also treated where cut.

I used bostik flashband for the flashing. I have very small dashing so had to knock that off first. I then used the bostik flashband primer on the wall first then rolled the flashband on. I used a heat gun to help it stick which seemed to have worked great.

Looking at the entire job the flashing is probably where I could have done it a bit better. I was on the roof doing it and it started to rain so rushed it. Its fine but have a few creases and bubbles.

Cerco · 06-03-2021 03:28PM

That’s great Fred. Thanks and well done !

Fine Cheers · 06-03-2021 06:17PM

What is the finish to your existing wall ? The tape can be tricky against a rough finish such as dry dash or rough cast. As mine is part of a car port type installation for a gym I needed it weathertight so have chased the wall for a proper flashing. For a pergola I think a decent mastic is sufficient depending on the substrate. How important is it to be absolutely 100% water tight given the ends are open i assume ?

fred funk }{ · 06-03-2021 08:22PM

DIY KING wrote: »

What is the finish to your existing wall ? The tape can be tricky against a rough finish such as dry dash or rough cast. As mine is part of a car port type installation for a gym I needed it weathertight so have chased the wall for a proper flashing. For a pergola I think a decent mastic is sufficient depending on the substrate. How important is it to be absolutely 100% water tight given the ends are open i assume ?

Its very small dashing. I knocked off all the stones from the dashing and left a rough stoney surface. I then painted that with the bostik primer, its like liquid bitumen. Rolled on the flashing with the help of a head gun and rolled it on, not a drop of water has come down through it.

Fine Cheers · 06-03-2021 08:53PM

Nice one. Sounds similar to Flashband tape ? How far up the wall did you go and how far onto the poly ? You seem to have a good slope too but no gutter ?

fred funk }{ · 06-03-2021 09:40PM

DIY KING wrote: »

Nice one. Sounds similar to Flashband tape ? How far up the wall did you go and how far onto the poly ? You seem to have a good slope too but no gutter ?

I got 225mm so did half in wall half on roof.

I wasn't sure about a gutter and don't like the look of them but I allowed for one if I want to put one on. I left a 60mm over hang of the poly so I can easily install one if needed. We have the ground slabbed so any water runs down into the drain but if you had grass it could be a problem.

Covered Pergola

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