The fans probably did as much as the insulation, that's good idea. I just can't see something that thick or the roof spaying being as good as 6 inches of R 27.
The fans probably did as much as the insulation, that's good idea. I just can't see something that thick or the roof spaying being as good as 6 inches of R 27.
I thought the same thing Df so when I bought the stuff I just did the area above the main bedroom to start with and you could notice the difference as soon as you walked in there, so I did the whole roof area as well. But you are probably right about the fans, they probably made more of a difference. I noticed when you turned the fans off on a hot day it only took an hour or so and the temperature rose noticeably.
To be honest if the fans were continually replacing that air in the roof cavity and not allowing it to heat up the insulation is probably not even needed, because all the foam does is stop that hot air radiating down into the living area.
The house I built in Australia had a high pitched roof with half the house open, without ceilings and the rest of the house had a loft area above the kitchen/bathroom.
I installed a exhaust fan up the top of the gable end which blew the air out and had louvre windows at the other end which were left open allowing fresh air to be brought in. People used to walk in there on a hot day and think there was an air con running.
I'm going with 6" sunshield (currently 329 for 0.6 by 4 metres).
First Homepro visit they said 'no have - no stock... better go with plastic'. Showing me the impressive R values on 6 millimetre foam rolls. The cost would be around 18,000.
Second visit to Bangplii homepro 'certainly Sir, pay 1000 deposit'. After 3 days the guy came to measure... cost will be around 9000 baht. I can't see hot air blasting it's way through this stuff - the fibreglass is protected by a foil bag.
I'll reserve my opinions of foam - I think it might be more suited to putting a layer on a 'hot' wall behind a layer of plasterboard for aircon rooms. (not sure about pricing - you can buy foam backed plasterboard too).
One assistant actually told me that my aircon would suck heat in from outside because I installed it on the hot sun-facing wall at the back of the house!!!!
In 2 years, after the 'control' phase of the moobahn is lifted, I'll be elevating the roof panel for our extended kitchen up to the second floor. Gotta keep the sun off!
Quote 'Over the past few weeks, there has been an intensive media campaign against the insulation program that has led to four young installation workers being killed by electrocution or heat stroke, at least 87 roof fires and 1,000 homes being declared electrically “live”.'
https://www.wsws.org/en/articles/2010/02/insu-f22.html
and this was with Aussi wiring! Think what Thai electrics could achieve.
If building a new roof, lay foil insulation on roof battens before tiles, but make sure that it is rolled out "Top to Bottom" and not across, because if there is any leak in tiles , water will run down to eaves, and not drain into ceiling cavity. Not so long ago i saw some Thai roof layers doing this across, probably because its easier. Told the boss who agreed and made them change it .
The "yellow peril" and the "foil" serve very different purposes.
The former stops convected heat and is most used (in Thailand) to keep cold (usually a/c'd) air in.
The latter stops radiant heat and is most used to keep hot air out.
The choice (one or both) should depend on what you want to do or what you can fit, not on keeping your ceiling clear.
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