Roof insulation.

spiff said:
a cavity wall is pretty insulated to start off with. I also spoke to the spray foam guys about spraying foam into the gap - they say it's doable, just drill holes strategically along walls and pump the foam in.

http://olympic-construction.co.uk/free-cavity-wall-insulation/
Click to expand...

I dunno, I got concrete block walls and during the summer, the sunny side walls get really hot inside. Anyways going off topics. This is about roof insulation.
 
spiff said:
brick cavity walls don't touch each other - so barely any heat transfer - cement blocks aren't suitable for that purpose.
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these big cement blocks already so weak . I will be scared that thr expanding foam will crack them .
I saw video clips where they lift and level concrete slabs with expanding foam
 
Yeah bricks, not blocks for what you worth. But yeah. POS, compared to proper clay bricks.
 
thehuman said:
these big cement blocks already so weak . I will be scared that thr expanding foam will crack them .
I saw video clips where they lift and level concrete slabs with expanding foam
Click to expand...

quite right - as long as there is space to expand (brick cavity wall) there will be no pressure build up - cement blocks are always blocked by cement so yes it could crack them.
 
I just got a PM that reminded me that it's a good time to feedback on my experience with 6 months of hindsight.
So my single piece of advice to anyone wanting to get roof insulation:
DIY
If I could turn, turn back the hands of time
Then my darlin' you'd still be mine
Sorry ... got carried away...
If I could turn back time, I'd definitely DIY, which would then mean I'd save the labour cost, and I'd be able to afford IsoTherm as opposed to ThinkGreen.
ThinkGreen works, don't get me wrong... but I would only have needed to spend marginally more than I did (if I was patient, and I hunted for a good special) to buy IsoTherm raw material (minus any labour cost) and then I'd do the installation myself , or at worst , with the assistance of any random handyman/gardener/cousin.
These "professionals" don't really do anything that you can't do yourself. And (unless you find someone who really takes his trade seriously, which is a very very rare occurrence) you'll always find that you would pay way more attention to detail than a "pro" would because this is for your own home.
 
Inevitability said:
I just got a PM that reminded me that it's a good time to feedback on my experience with 6 months of hindsight.
So my single piece of advice to anyone wanting to get roof insulation:
DIY
If I could turn, turn back the hands of time
Then my darlin' you'd still be mine
Sorry ... got carried away...
If I could turn back time, I'd definitely DIY, which would then mean I'd save the labour cost, and I'd be able to afford IsoTherm as opposed to ThinkGreen.
ThinkGreen works, don't get me wrong... but I would only have needed to spend marginally more than I did (if I was patient, and I hunted for a good special) to buy IsoTherm raw material (minus any labour cost) and then I'd do the installation myself , or at worst , with the assistance of any random handyman/gardener/cousin.
These "professionals" don't really do anything that you can't do yourself. And (unless you find someone who really takes his trade seriously, which is a very very rare occurrence) you'll always find that you would pay way more attention to detail than a "pro" would because this is for your own home.
Click to expand...

Very much in agreement. I was recently up in my sister's roof to check out a possible burst geyser which gave me a lot of time to check the installation of their insulation. I also checked all pipes running to and from the geyser as well and I had to lift a lot of the insulation in the process to check on these. Honestly I was really underwhelmed with the quality of the work. It was clearly rushed. I at least got the opportunity to properly reinstall some of the pieces that were simply 'mushed' in.

One piece of advise for people thinking of installing insulation: please make sure your roof isn't leaking and be sure to monitor this on a ongoing basis once your insulation is in. Turns out my sister had two leaks in her roof but the insulation had soaked up a lot of the leaking water which meant the leaks only became apparent during a bout of very heavy rain. She now needs to replace a fairly large section of insulation in addition to ceiling boards.
 
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Anyone have contacts for supply and install of Aerolite 135mm in CPT? Thanks
 
No, but you can get the green stuff from Build-It and Builders Warehouse in various thicknesses.
 
I have Isotherm installed in December...also had the roof vacuumed...

What a difference. On those hot days the house is so cool inside.

We had the 140mm thickness installed.
 
catman37 said:
I have Isotherm installed in December...also had the roof vacuumed...

What a difference. On those hot days the house is so cool inside.

We had the 140mm thickness installed.
Click to expand...

How much to vacuum and sq mtrs please. I need to have this done as well.
 
I checked the roof of our house recently, and the aerolite pink was clearly installed quite poorly, with LOTS of gaps. It also looks very old - I tried moving some of it around to close some of the bigger gaps, and it just tore to bits.

Since working with the pink stuff is as fun as selling your soul to the devil, I was considering just getting Isotherm and putting it on top of the existing attempt. But would this be a waste of time/money, or potentially cause problems?
 
HdB said:
I checked the roof of our house recently, and the aerolite pink was clearly installed quite poorly, with LOTS of gaps. It also looks very old - I tried moving some of it around to close some of the bigger gaps, and it just tore to bits.

Since working with the pink stuff is as fun as selling your soul to the devil, I was considering just getting Isotherm and putting it on top of the existing attempt. But would this be a waste of time/money, or potentially cause problems?
Click to expand...

Not a fun job even in the middle of winter! The problem I think is the dust and other rubbish that collects in the roof. By far the easiest is simply to lay it over the existing insulation but not at all sure if this is a good idea.
 
Hi, the ultimate insulation for houses is Lambdaboard.

Im the technical and sales guy for this stuff and i can tell you that it has a 25% better efficiency than polystyrene, its waterproof and can be installed as a ceiling, its the same stuff that is found in a fridge, the yellow honeycomb foam. Technical name is Polyisocyanurate.
Some people say its Polyurethane, it is similar but not the same.

The benefit of using this stuff is that it doesn't compress so it holds its insulation value over time.
For the technical minded the 80mm Lambdaboard offers the max insulation for a ceiling in Gauteng R-Rating of 3.3
Standard spec in all Pick n Pay stores, Woolworths and its being used now at the Luftus Versveld refurb

Call me on 0845147000 for more info, regards Kenneth
 
battman said:
Hi, the ultimate insulation for houses is Lambdaboard.

Im the technical and sales guy for this stuff and i can tell you that it has a 25% better efficiency than polystyrene, its waterproof and can be installed as a ceiling, its the same stuff that is found in a fridge, the yellow honeycomb foam. Technical name is Polyisocyanurate.
Some people say its Polyurethane, it is similar but not the same.

The benefit of using this stuff is that it doesn't compress so it holds its insulation value over time.
For the technical minded the 80mm Lambdaboard offers the max insulation for a ceiling in Gauteng R-Rating of 3.3
Standard spec in all Pick n Pay stores, Woolworths and its being used now at the Luftus Versveld refurb

Call me on 0845147000 for more info, regards Kenneth
Click to expand...
Sounds interesting, what size sheets do they come in?

Mounting with 2-sided tape?

Ballpark price / m^2?
 
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