Effect of insulating our roof

SykomantiS said:
Has anyone used Isoboard?
I'm thinking of going this route, maybe with a retrofit installation onto the existing ceiling boards.

The majority of our roof is flat, "sink dak" and one or two bedrooms have slanted roof tile roofs (also no entrance points into the ceiling), with only about a foot between the roof and the ceiling, and no manhole covers or entrances, since almost nothing or no one will fit there.
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If your ceilings are still good I would rather go with the isotherm. It has a better R rating.
The Isoboard also expands and contracts a lot needing expansion grooves and you will also lose ceiling height.

You also get insulation they spray in with a hose that may work.
 
Mike Hoxbig said:
Everyone getting aircons now should have this done first or it'll be wasteful. The compressor will pretty much be running all the time without insulation...
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I was close to pulling the trigger on a/c last summer but I'm not sure we need it anymore. Will pay for itself if insulation saves the whole a/c installation nevermind the operating costs.
 
Tomtomtom said:
I was close to pulling the trigger on a/c last summer but I'm not sure we need it anymore. Will pay for itself if insulation saves the whole a/c installation nevermind the operating costs.
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Good plan. I think the insulation will be good enough
 
Tomtomtom said:
I was close to pulling the trigger on a/c last summer but I'm not sure we need it anymore. Will pay for itself if insulation saves the whole a/c installation nevermind the operating costs.
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Thing is it brings you instant relief when you step into the house from outside. Especially during weather extremes. It's like you can quench your thirst with warm tap water, but nothing beats a cold coke/beer...
 
I am planning to isotherm in piecemeal. First my daughter room, then mine, then the living room etc.
 
B-1 said:
If your ceilings are still good I would rather go with the isotherm. It has a better R rating.
The Isoboard also expands and contracts a lot needing expansion grooves and you will also lose ceiling height.

You also get insulation they spray in with a hose that may work.
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The problem is I don't know how they will get into the roof structure to lay down or spray that stuff.
 
SauRoNZA said:
I’ve been wondering if these would make any difference to my garage which of course has no ceiling or insulation of any kind.
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I have a zink aluminum flat roof in the garage.

The garage used to easily be 10 degrees Celsius hotter compared to ambient temperatures and if it is warm for a couple of days In a row this can spike to 15 degrees Celsius. And it did not cool down during the evenings.

I recently installed Airolight (135mm) and 100mm isoboard. The garage temperature it matches ambient temperatures.

The LFP batteries have not gottenabove 25 degrees (cell temperature) this summer.

Total cost was R 30k so not cheap. I do have a large garage at 10m by 6.5m
 
Koosvanwyk said:
I have a zink aluminum flat roof in the garage.

The garage used to easily be 10 degrees Celsius hotter compared to ambient temperatures and if it is warm for a couple of days In a row this can spike to 15 degrees Celsius. And it did not cool down during the evenings.

I recently installed Airolight (135mm) and 100mm isoboard. The garage temperature it matches ambient temperatures.

The LFP batteries have not gottenabove 25 degrees (cell temperature) this summer.

Total cost was R 30k so not cheap. I do have a large garage at 10m by 6.5m
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So you put in a ceiling?

Or just boarded up the frame?
 
Koosvanwyk said:
Put the Airolight between the roof rafters just below the zink aluminum roof and the isoboard just below that, also between the roof rafters. So I suppose you can call it a ceiling.View attachment 1779513
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Hmm then I would lose all my storage space.

Reckon I’ll try the twirly bird first in the new year and see how it goes.
 
Koosvanwyk said:
Put the Airolight between the roof rafters just below the zink aluminum roof and the isoboard just below that, also between the roof rafters. So I suppose you can call it a ceiling.View attachment 1779520
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Planning to do something similar. What did you secure the isoboard to? I have steel rafters and not much height so would like to somehow hang the board flush with them.
 
I am a firm believer in roof insulation. Isotherm is the bomb. I also had isoboard installed in my Hollywood garage. Made one hell of a difference.

However my house roof cavity just does not allow for an Isotherm installation. There is no space. Ceilings are high AF and the chromadeck roof has a mild slope so space is limited. Also I have about 50 downlights upstairs alone.

Whenever I turn off the AC in my room its a couple of minutes and the heat is back. Not ideal I know.
 
Tomtomtom said:
Planning to do something similar. What did you secure the isoboard to? I have steel rafters and not much height so would like to somehow hang the board flush with them.
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Rafters is wood, hammered in a frame using 5x5 wood trusses. Isoboard was fixed to the trusses using the clips supplied with the isoboard.

Used something similar to this.

1000022408.jpg

You should able able affix those clips to the steel rafters using the appropriate screws. The isobard sections then slide into each other the tongue and groove.
 
I've recently been watching some aerogel videos, it seems like its becoming easier and easier to manufacture at scale now.

It would be interesting to see what a layer of that can do for a house.
 
Hi all,

Looking at putting in some insulation into our home soon, but one thing I see about Isotherm (which I like as it's polyester-based) is that it's not SABS approved.

Is this something that may become an issue if something were to happen and it catches fire (worst-case scenario here)? I'd hate to have something silly like that nullify an insurance payout but I am not 100% sure on building code and what the SABS approval may have to do with that.

1736768341708.png
 
PhireSide said:
Hi all,

Looking at putting in some insulation into our home soon, but one thing I see about Isotherm (which I like as it's polyester-based) is that it's not SABS approved.
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Why not just get Aerolite? It's SABS-approved and better value afaict. If you're worried about the itch it's not too bad. You only handle it once and you need some PPE anyway up there (dust mask and gloves).
 
Tomtomtom said:
Why not just get Aerolite? It's SABS-approved and better value afaict. If you're worried about the itch it's not too bad. You only handle it once and you need some PPE anyway up there (dust mask and gloves).
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I'm in the roof at least once or twice a month, so something that doesn't make me itch would be beneficial.

We stay by the coast so the slightly lower R-value of Isotherm vs Aerolite shouldn't make too much of a difference in our area.
 
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