insulating patio roof ABOVE roof?

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insulating patio roof ABOVE roof?

Postby lizzydiz88 » Mon Nov 17, 2014 12:23 am

We have a lovely (8 years old) 4 x 11 metre patio on the north side of our house, with one of those metal roofs which has a ceiling on one side and a roof on the other, installed in strips. The problem is in summer, when the heat radiates down and bakes us, which means that we don't want to hang out on the patio, but also we can feel the heat radiating into the house from the patio. I've looked at those insulated ceiling panels, but they'd cost thousands, and the roof we have is still in great nick.

My husband is keen to insulate under the roof, but I'm reluctant to add insulation that will cover the attractive finish that is there, and concerned as to how to attach it without it sagging or looking rough-as. As we can't see the rooftop, I'd be interested in stopping the heat on top, if there is any possible way to do that. We recently used Foilboard (polystryrene panels with foil) inside the garage door with great success, but no insulation products I can think of are designed to cope with rain and sun exposure. One person I heard of simply stretched and tied on shade cloth along the top of the roof in summer, but not sure of how it would cope with windy weather. The roof is also a lightweight structure, not load-bearing, so anything added to either top or bottom would have to be lightweight.

Any suggestions out there? It was 40 degrees weather today, and if this is spring, I'm truly dreading summer, and need to keep on with adjusting my house for climate change.
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Re: insulating patio roof ABOVE roof?

Postby Alex Morrow » Mon Nov 17, 2014 8:30 am

My thought would be about how to get some insulation between the roof layer and the ceiling layer - I presume there’s a void there? I’d try to pack it with as much lightweight insulation as possible. Our last couple of days have been 41° and 39°, and that’s on the thermometer in the shade on the southern side of the house. When we feel the heat coming on, we come inside and close all the doors and windows; I don’t think the interior temperature would have gone above about 32° at the hottest in the last two days. We let the roof insulation and high ceilings do their job.
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Re: insulating patio roof ABOVE roof?

Postby davidg » Mon Nov 17, 2014 9:30 am

Whats the gap between the roof metal and the underside or am I looking at the underside of the actual roof metal?
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Re: insulating patio roof ABOVE roof?

Postby bpratt » Mon Nov 17, 2014 10:26 am

What colour is the top of that patio roof ?

If it is as hot as you say it is, I'm guessing it is a dark colour above it.

On my old home, I painted the zincalume roof with Dulux Weathershield in the Colourbond colour of Thredbo White, and that made a huge difference to the house. That could be a good option for this patio roof of yours, and might be the cheapest option.
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Re: insulating patio roof ABOVE roof?

Postby lizzydiz88 » Mon Nov 17, 2014 12:56 pm

Hi all,
The roofing is one of those single piece steel roofing systems, with the roof on one side, and the ceiling on the other, joined together. There is no space between ceiling and roof, so no possibility of putting insulation in the middle.

The roof is white, so the colour isn't the problem, just horribly hot weather.

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Re: insulating patio roof ABOVE roof?

Postby Gordon-Loomberah » Mon Nov 17, 2014 1:27 pm

That looks like the veranda roofing system I've seen a bit of lately when out on jobs with my wife- there are insulating panels that slide in under the roof and give a smooth appearance. I think its a C-channel section fixed along the sides, and the panels get pushed in from one end, giving a neat appearance, and they make a big difference.
You could always add a PV panel array on top to shade the roof (added to existing system or off-grid, depending on circumstances), to reduce the heat load a bit.
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Re: insulating patio roof ABOVE roof?

Postby ghind » Thu Nov 20, 2014 11:03 am

please put up a photo from higher up, showing your house roof and the patio roof together. It looks like there is room to put up some eye bolts (replace some roofing screws) and install shade cloth. That will be by far the most economical way to solve this - stop the sun hitting the roof altogether.
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Re: insulating patio roof ABOVE roof?

Postby Tracker » Thu Nov 20, 2014 6:09 pm

..
It looks more like a single skin Klip-Lock type roofing..

Are the structural gutters making it look like there is a depth to the actual roof...??
..
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Re: insulating patio roof ABOVE roof?

Postby lizzydiz88 » Sat Nov 22, 2014 5:33 pm

Hi,
Yes it is a single-skin Klip-Lok type roof, I just didn't know what to call it. The only screws are along the wall against the house, and along the outside edge, none in the middle as the strips just clip together. I've climbed the fence, my adventure for the day, so that I could take a photo of how it looks on top. The patio is on the left of the pics. I quite like the shade cloth option, if it is workable.


Regards, Liz
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