Roof insulation.

Inevitability said:
So I finally got my insulation done last week!
Used the green stuff (Think Green, mentioned in my previous posts).
The installation guys just rip it to size and lay it snugly between the horizontal roof trusses. It's easy to move out of the way and put back into place if I need to get any work done in the ceiling.
Total cost was around R7k for my roof which is about 110sqm. That's cheaper than any of the other PET insulation quotes I'd got, and cheaper than the guys who have posted previously on the thread... Us charous don't rest until we find the best deals! :D
Admittedly, my ceiling is a super simple 110sqm rectangle... no walls up there. So that probably helped.

As for the performance of the insulation:
It's made a nice difference... I'm right on the banks of the Jukskei so I'm starting to feel winter temperatures in the mornings (I really need to get a thermometer to quantify the outside vs inside temps).
Given the way it was going in the last couple of weeks, I probably would have needed to use some heating this past week if I hadn't had the insulation installed. So it's already effective.
The absolute test, though, is how far I can go into May before needing to switch on the heating.
I will report back on the first day I light up the heater.
Click to expand...

Mind giving us an update on how your Think Green insulation is performing? You still happy with the product?
 
martin said:
Mind giving us an update on how your Think Green insulation is performing? You still happy with the product?
Click to expand...
I was meaning to post an update... thanks for the reminder.
Ok, so around the 1st June, the temperature at my house has plummeted and I've had to light up the anthracite heater every night.
Quick reminder, I live on the banks of the Jukskei so it's always a good few degrees colder at my house than it is in the surrounding area, even the entrance gate of my complex (which is like 200m away).
I'm quite happy that the insulation pulled me through until June... there is no doubt whatsoever that the insulation is effective.

I went into the ceiling last week to check a possible water leak, and noticed that there's a few gaps in the insulation ... called the guy and he's gonna come by and fix the gaps.
Might not make the world's biggest difference, but it still means the insulation has the potential to perform (marginally) better.

As for how it's performing together with the heater fired up ... Again, it's a noticeable difference. Last year the heater (as effective as it is) only really warmed up the lounge, but now the heat does dissipate further, and I'm using the heater on the absolute lowest burn (...inlet air vent closed to the point where it's almost completely shut)
Admittedly, my house was not designed in a way that encourages heat flow (...a point which I hope to address in future). But I'm not really sure how this affects any evaluation of the insulation's performance.
If I had a thermometer this post would have been a thousand times more useful cos it would be a quantitative assessment (inside vs outside temps)... right now all i can offer is my feelings on the matter...
Which is that I am very happy with the performance, and I am very very sure that if you're living in a house that's not on the Ice planet of Hoth, then this stuff is gonna drastically reduce your need for heating in Winter
 
Zoomzoom said:
Thanks for the link - ceiling and insulation all in one mum = good deal.
Click to expand...
But the material alone is R174/m^2 excl vat... That actually excludes clips, glue, skim/rhinolite and paint. (That is for the 50mm)
 
Inevitability said:
I was meaning to post an update... thanks for the reminder.
Ok, so around the 1st June, the temperature at my house has plummeted and I've had to light up the anthracite heater every night.
Quick reminder, I live on the banks of the Jukskei so it's always a good few degrees colder at my house than it is in the surrounding area, even the entrance gate of my complex (which is like 200m away).
I'm quite happy that the insulation pulled me through until June... there is no doubt whatsoever that the insulation is effective.

I went into the ceiling last week to check a possible water leak, and noticed that there's a few gaps in the insulation ... called the guy and he's gonna come by and fix the gaps.
Might not make the world's biggest difference, but it still means the insulation has the potential to perform (marginally) better.

As for how it's performing together with the heater fired up ... Again, it's a noticeable difference. Last year the heater (as effective as it is) only really warmed up the lounge, but now the heat does dissipate further, and I'm using the heater on the absolute lowest burn (...inlet air vent closed to the point where it's almost completely shut)
Admittedly, my house was not designed in a way that encourages heat flow (...a point which I hope to address in future). But I'm not really sure how this affects any evaluation of the insulation's performance.
If I had a thermometer this post would have been a thousand times more useful cos it would be a quantitative assessment (inside vs outside temps)... right now all i can offer is my feelings on the matter...
Which is that I am very happy with the performance, and I am very very sure that if you're living in a house that's not on the Ice planet of Hoth, then this stuff is gonna drastically reduce your need for heating in Winter
Click to expand...

Thanks for the update. I realise it's subjective but it's good to know that you notice a difference. The building in which I work (an old three storey concrete and brick affair next to a small river) has recently installed Think Green on all floors. A week ago it got so hot that everyone knocked off early, it was just impossible to work. The building has central heating/cooling and we had to ask for the temperature to be lowered. I didn't want to go on just that though as it's lots of warm bodies + central heating + insulation and those aren't the typical conditions you'll find in a home. You feedback really helps so thanks for that!

And of course, a thousand extra points for managing to sneak a Star Wars reference into a insulation discussion.
 
P924 said:
But the material alone is R174/m^2 excl vat... That actually excludes clips, glue, skim/rhinolite and paint. (That is for the 50mm)
Click to expand...

Hi, first time poster.

I bought an old house a while back (build in the late 60's), and I am looking at ways of insulating the ceilings.

The ceilings in the house are high and flat, i.e. with a small space between the roof-plate, which is asbestos, and the gypsum ceiling board.

The house does have think pink in but the ceilings are pretty old and haggard. I want to know if it is possible to put ISOBoard onto the existing gypsum ceiling? The ISOBoard finish looks fine, so I am thinking to leave it in and just add the ISOBoard to it to create better insulation and to freshen up the look.

Any thoughts/advice?

Much appreciated.
 
P924 said:
But the material alone is R174/m^2 excl vat... That actually excludes clips, glue, skim/rhinolite and paint. (That is for the 50mm)
Click to expand...

but if I'm putting in a new ceiling I'm assuming (perhaps incorrectly) that 1 cost albeit a bit higher is less than any other insulation product + fitting a new ceiling. There is one installation apart from anything else.
 
Zoomzoom said:
but if I'm putting in a new ceiling I'm assuming (perhaps incorrectly) that 1 cost albeit a bit higher is less than any other insulation product + fitting a new ceiling. There is one installation apart from anything else.
Click to expand...

When I did all the calculation, this was the most expensive option overall. But it will depend on what you pay for installation. That plus the 80mm I would have lost swayed me. I still think isoboard is a great product and concept, albeit a bit too expensive IMO.
 
P924 said:
When I did all the calculation, this was the most expensive option overall. But it will depend on what you pay for installation. That plus the 80mm I would have lost swayed me. I still think isoboard is a great product and concept, albeit a bit too expensive IMO.
Click to expand...

Yeah I admit to not having done any sums yet. Am contemplating what to do - thinking zinc roof with no ceiling or insulation might not be such a great idea, but working on limited budget means ceilings may have to wait.
 
I installed ISOTherm at the beginning of December last year (145mm isotherm – 100m2 @ R85/m2 installed) through www.homeinsulations.co.za. They seem to just subcontract - service from both them and contractor was great. I asked them to wrap the geyser and hot water pipes too.

Seems to work well - we only used the aircon two or three times since (and for 1 hour max vs all night previously) and today is the first time i feel like firing up the gas heater. We live in a double storey house and I used to notice a massive difference in temperature between the two floors (freezing upstairs but relatively warm downstairs). This has normalized since.
 
I got my install (145mm isotherm) booked for the 24th. Will try take some temp readings before and after to see if there is a measurable difference.
 
Cavitybatt has a slightly higher thermal resistance than isotherm
 
Tried to contact the Think Green guys all through last week via phone and their contact form on their website. Eventually got a call back on Friday afternoon. Guy phoning me was rude but promised to phone me back later. Never happened. Then I came across this: http://www.house-cleaning-tips-guide.com/think-green-insulation/

I'm now at a point where I'm not crazy about the idea of doing business with them. Phoned the IsoTherm manufacturers and immediately got a quote. I reckon I'm willing to pay a premium for piece of mind and good service.
 
P924 said:
When I did all the calculation, this was the most expensive option overall. But it will depend on what you pay for installation. That plus the 80mm I would have lost swayed me. I still think isoboard is a great product and concept, albeit a bit too expensive IMO.
Click to expand...

I guess it depends on your needs... mine worked out cheaper, mainly due to specific job, the ceiling I'm doing is 'weird' apparently :D, had 2 quotes done for insulation and ceiling, both required new ceiling to be up first, then due to whatever reason(no space to work/feed **** in or something and angles would allow something else to go from there on that thing /shrug), 'roof' to be removed so insulation could go in, then putting roof back on, which eish becomes a pain in the backside, so, started to become 15k+(then have to the add the re-waterproofing on top of it so another 5k), whereas, diy like nutsman me, all clips glues boards cornising all just overlaying on old ceiling worked out at 4.5k. Yeah, need to spend a weekend doing it, but hey, saves a ton at end of day.
 
martin said:
Tried to contact the Think Green guys all through last week via phone and their contact form on their website. Eventually got a call back on Friday afternoon. Guy phoning me was rude but promised to phone me back later. Never happened. Then I came across this: http://www.house-cleaning-tips-guide.com/think-green-insulation/

I'm now at a point where I'm not crazy about the idea of doing business with them. Phoned the IsoTherm manufacturers and immediately got a quote. I reckon I'm willing to pay a premium for piece of mind and good service.
Click to expand...

When I phoned Think Green, it said their tel.# no longer exists. I used the contact form on their website and never had a response. Some people should just close their business down.
 
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