4myr Posted May 11, 2023 Share Posted May 11, 2023 Hi, I was wondering, have anyone done this experiment in Thailand before? Paint your roof with lime wash, a mixture of hydrated lime, water, linseed oil [for waterproofing] and table salt [for durability]. I have a corrugated fibre cement roof with a lot of heat mass, which keeps my attic space between 45-65C and my ceiling at 38-39C on a hot day [32-35C]. My roof rafts and truss is made from steel and conducts & radiates the roof heat and transfers it to the inner walls as well. I have been considering insulation options like spray PU foam [against roof in attic space] or mineral wool insulation [attic floor], however this painting method is more friendly to human, environment [where I live the soil is acidic] and my pocket. The temperature effect as shown in below YT video is dramatic [around 20C temp decrease in attic space]. Unfortunately in a moderate climate with lower ambient temp and where the sun does not shine as hot. I would be happy if the attic floor temp can be lowered to 30-35C and the inner walls 1-2C above ambient temperature. I estimate the paint price to be around 7B per m2 for 2 coatings. Normal roof paint costs around 35B / m2. I can't find a price for a ceramic based roof paint, which will reflect the sun much better than ordinary roof paint or lime wash, but assume it is much more expensive. I will need to hire someone to go on the roof to [re-]do the paint job and remove the dirt on the white paint on a regular basis. Any thoughts on how more often I need to repaint lime wash vs repainting using a synthetic roof paint, which I supposed is more waterproof and more durable. Here some links about this subject: Hydrated Lime as a Highly Reflective Roof Coating for Home Cooling How much can painting a roof white reduce its temperature? Link to comment Share on other sites More sharing options...
Kwasaki Posted May 11, 2023 Share Posted May 11, 2023 Vent the roof and eaves then put rolls of fibreglass wrapped in silver wrapping on your ceiling area the thicker the better. Job done. Windows, walls may need attention with shaded. Link to comment Share on other sites More sharing options...
sometimewoodworker Posted May 11, 2023 Share Posted May 11, 2023 (edited) If you are keen on a DIY job then spray on barium sulfate, you will need about 30 very thin coats but you will then have the most reflective (to heat) surface possible. The material is not expensive, but the process is rather laborious Edited May 11, 2023 by sometimewoodworker 1 1 Link to comment Share on other sites More sharing options...
h90 Posted May 13, 2023 Share Posted May 13, 2023 On 5/11/2023 at 5:19 PM, Kwasaki said: Vent the roof and eaves then put rolls of fibreglass wrapped in silver wrapping on your ceiling area the thicker the better. Job done. Windows, walls may need attention with shaded. That works very well....only the silver wrapping went to dust...it is aluminum foil that corroded.....when you go up the roof you can't breath so much fibers in the air. 1 Link to comment Share on other sites More sharing options...
h90 Posted May 13, 2023 Share Posted May 13, 2023 Just now, h90 said: That works very well....only the silver wrapping went to dust...it is aluminum foil that corroded.....when you go up the roof (the room between roof and ceiling) you can't breath so much fibers in the air. Link to comment Share on other sites More sharing options...
Kwasaki Posted May 13, 2023 Share Posted May 13, 2023 2 hours ago, h90 said: That works very well....only the silver wrapping went to dust...it is aluminum foil that corroded.....when you go up the roof you can't breath so much fibers in the air. 16 years on my foiled covered fibreglass is in tact. 2 Link to comment Share on other sites More sharing options...
dinga Posted May 19, 2023 Share Posted May 19, 2023 On 5/13/2023 at 4:34 PM, Kwasaki said: 16 years on my foiled covered fibreglass is in tact. Be glad you don't have a rodent problem (my b*ggers are very happy to chew the batts) 1 Link to comment Share on other sites More sharing options...
Kwasaki Posted May 19, 2023 Share Posted May 19, 2023 1 hour ago, dinga said: Be glad you don't have a rodent problem (my b*ggers are very happy to chew the batts) Do something about it, easily done. I have no problem in my village. 1 Link to comment Share on other sites More sharing options...
dinga Posted May 19, 2023 Share Posted May 19, 2023 7 minutes ago, Kwasaki said: Do something about it, easily done. I have no problem in my village. Hard to imagine someone NOT to "do something about it". Am using traps to secure and relocate the little b*ggers (since killing them is not an option...) Delighted if you have 'something' that addresses the problem Link to comment Share on other sites More sharing options...
Kwasaki Posted May 19, 2023 Share Posted May 19, 2023 10 minutes ago, dinga said: Hard to imagine someone NOT to "do something about it". Am using traps to secure and relocate the little b*ggers (since killing them is not an option...) Delighted if you have 'something' that addresses the problem What i mean is we don't have a problem with rodents. Stick some wild cats up in your loft. ???? My in-laws smoke out the the loft areas. Link to comment Share on other sites More sharing options...
Crossy Posted May 19, 2023 Share Posted May 19, 2023 1 hour ago, dinga said: Hard to imagine someone NOT to "do something about it". Am using traps to secure and relocate the little b*ggers (since killing them is not an option...) Just remember, rats "home": - 2 Link to comment Share on other sites More sharing options...
BenStark Posted May 19, 2023 Share Posted May 19, 2023 (edited) 1 hour ago, dinga said: Hard to imagine someone NOT to "do something about it". Am using traps to secure and relocate the little b*ggers (since killing them is not an option...) Delighted if you have 'something' that addresses the problem Why is killing not an option, do you consider them pets? I have these in my loft, outside the house in covered drains, as well as on the ceilings from my roof overhangs, and I have no problem with rodents. If occasionally some enter the loft, they are gone within a day. Available on Lazada, makro and tesco. Flocoumafen Edited May 19, 2023 by BenStark 1 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted May 19, 2023 Share Posted May 19, 2023 13 minutes ago, BenStark said: Why is killing not an option The smell! 1 Link to comment Share on other sites More sharing options...
Kwasaki Posted May 19, 2023 Share Posted May 19, 2023 3 minutes ago, sometimewoodworker said: The smell! Vented roof. ???? Link to comment Share on other sites More sharing options...
sometimewoodworker Posted May 19, 2023 Share Posted May 19, 2023 7 minutes ago, Kwasaki said: Vented roof. ???? So that not only you can enjoy the fragrant odour of death but all the surrounding people can have the pleasure!!! 1 1 Link to comment Share on other sites More sharing options...
KannikaP Posted May 19, 2023 Share Posted May 19, 2023 5 minutes ago, sometimewoodworker said: So that not only you can enjoy the fragrant odour of death but all the surrounding people can have the pleasure!!! Do you mean that the neighbours a few hundred metres away could smell a dead rat after a week? Link to comment Share on other sites More sharing options...
KannikaP Posted May 19, 2023 Share Posted May 19, 2023 20 minutes ago, sometimewoodworker said: The smell! The body of a dead rat wiull be minimal and gone within days, dried up. Link to comment Share on other sites More sharing options...
sometimewoodworker Posted May 19, 2023 Share Posted May 19, 2023 14 minutes ago, KannikaP said: The body of a dead rat wiull be minimal and gone within days, dried up. You obviously haven’t come across our particularly large well fed versions! 1 Link to comment Share on other sites More sharing options...
KannikaP Posted May 19, 2023 Share Posted May 19, 2023 10 minutes ago, sometimewoodworker said: You obviously haven’t come across our particularly large well fed versions! From where are they getting their food? Link to comment Share on other sites More sharing options...
sometimewoodworker Posted May 19, 2023 Share Posted May 19, 2023 1 hour ago, KannikaP said: From where are they getting their food? Take your pick. 1 1 Link to comment Share on other sites More sharing options...
KannikaP Posted May 19, 2023 Share Posted May 19, 2023 (edited) 2 minutes ago, sometimewoodworker said: Take your pick. I've got no rats in my place Edited May 19, 2023 by KannikaP Link to comment Share on other sites More sharing options...
dinga Posted May 19, 2023 Share Posted May 19, 2023 2 hours ago, sometimewoodworker said: The smell! Funnily enough (given we live in Thailand), my wife is Buddhist and killing them is out of the question Link to comment Share on other sites More sharing options...
Popular Post sometimewoodworker Posted May 19, 2023 Popular Post Share Posted May 19, 2023 1 hour ago, dinga said: Funnily enough (given we live in Thailand), my wife is Buddhist and killing them is out of the question We don’t kill them ! We just feed them, then they decide to die! 1 2 Link to comment Share on other sites More sharing options...
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