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4MyEgo

Reducing The Heat In The House

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4 minutes ago, chiang mai said:

There should be no need to use a thermostatic fan if you get the exhaust and eves intake balance right and sized correctly, the two of those things will create a natural draft as others have described. Having said that I also have installed a thermo. fan but it's more belt and braces than anything else. On a hot day there is a layer of cool air on my attic floor that is about one to one and a half feet above the foil covered insulation (the last line of defence), above that it gets very hot very quickly, that protective layer is the affect of the cool air in pushing the hotter air up and vica versa.

 

Im from florida, climate very similar to Thailand. Just about every modern home will have a thermo fan(s) in the attic space  and lots of ventilation. Heat rises and expands, but its far and away more effective to force ventilate than to allow it to heat up in the first place. 

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Just now, Strange said:

 

Im from florida, climate very similar to Thailand. Just about every modern home will have a thermo fan(s) in the attic space  and lots of ventilation. Heat rises and expands, but its far and away more effective to force ventilate than to allow it to heat up in the first place. 

 

I've also lived in Florida so I am aware however, I disagree that forced ventilation is superior to natural balanced ventilation. I think that the art of keeping a house cool is a multi faceted task that needs a lot of different components to work together in a balanced way. Roof tiles need to be a light colour to reflect heat, rafter and joists should be formed from non-conductive material such as wood, ridge vents and vented soffits are essential to attic ventilation - right there are three critical items that 99% of houses in Thailand simply don't have and where houses in say Florida are light years ahead. The problem here is that everyone is trying to retrofit their houses to cater for poor design.

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9 minutes ago, chiang mai said:

I've also lived in Florida so I am aware however, I disagree that forced ventilation is superior to natural balanced ventilation.

let's agree to disagree. some people just don't believe in the laws of thermo physics. but then... they are entitled to :smile:

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18 minutes ago, chiang mai said:

I've also lived in Florida so I am aware however, I disagree that forced ventilation is superior to natural balanced ventilation. I think that the art of keeping a house cool is a multi faceted task that needs a lot of different components to work together in a balanced way. Roof tiles need to be a light colour to reflect heat, rafter and joists should be formed from non-conductive material such as wood, ridge vents and vented soffits are essential to attic ventilation - right there are three critical items that 99% of houses in Thailand simply don't have and where houses in say Florida are light years ahead. The problem here is that everyone is trying to retrofit their houses to cater for poor design.

 

Yep agreed. It is a multi faceted task, but it needs to be said that you have to use whats available to you. 99% of houses are block wall, steel rafter/joist/purlin, tile roof structures. Florida is light years ahead and still we use forced ventilation because it helps lower cooling requirements for a home even on top of the fact that its well insulated with double paine windows etc... 

 

Roof tiles here imho the biggest mistake a person can make if they build their own home in Thailand. There is no benefit to anything other than aesthetics. But they are here and radiate and hold heat like a heat sink well into the night. 

 

 

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Yep.....windows are real weak spots when it comes to keeping out the heat. Designed our house to have as few as necessary without making the inside dark.

It's surprising the number of newbies that decide to build a house here and put in as many windows as possible to allow cool breezes to blow through their house.

 

Got those soffit boards all around our house to try and encourage airflow in the attic along with lots of insulation up there.

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3 hours ago, 4MyEgo said:

 

Agreed, as I only just put them up a few days ago, I haven't even gone to the trouble of painting them which I will get a round to, and as I have an artistic, not autistic wife, she can add her flare to them, or we just paint them the same colour as the house. 

 

As for the fire exits, absolutely covered, keys with me by the bedside table at night, we are not one for security grills, but don't wish to stress when we go away, not that anything would happen in the village, but why risk it.

Might consider leaving keys in locks of fire doors instead of trying to find them when you may be under pressure to get out

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Any suggestions as to what to do when you don't have any attic - or none that is accessible? The stairspace goes all the way up to the roof as far as I can tell.  I don't open windows/doors upstairs as the amount of dust that would come in is not something to countenance. The roof overhangs in places but no vents at all.

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3 hours ago, Strange said:

 

Yep agreed. It is a multi faceted task, but it needs to be said that you have to use whats available to you. 99% of houses are block wall, steel rafter/joist/purlin, tile roof structures. Florida is light years ahead and still we use forced ventilation because it helps lower cooling requirements for a home even on top of the fact that its well insulated with double paine windows etc... 

 

Roof tiles here imho the biggest mistake a person can make if they build their own home in Thailand. There is no benefit to anything other than aesthetics. But they are here and radiate and hold heat like a heat sink well into the night. 

 

 

Can you clarify what you mean about roof tiles ,especially any recommendations as to type and brands. It does amaze me how Thais put garish inappropriate darker colours up. Is it just ignorance? 

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6 minutes ago, nchuckle said:

Can you clarify what you mean about roof tiles ,especially any recommendations as to type and brands. It does amaze me how Thais put garish inappropriate darker colours up. Is it just ignorance? 

I saw a heap of new cottages built in the Koh Lak area a while back, and the tiles were all fibro type, about 3mm thick, Swiss pattern.

 

They looked neat and certainly not the heat sinks or weight that Concrete tiles would be.  

 

The owner fitted aluminium sarking which would have cut back a large heat gain.

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I used an insulated white metal roof.

If I stick my head through the hole in the ceiling it actually feels much cooler than the top of the room where the heat accumulates.

So much so, that I am considering ceiling vents so that heat can escape.

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I just installed a bigger A/C.  

 

I know that's cheating, but it's frigging hot here no matter what. 

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12 minutes ago, nchuckle said:

Can you clarify what you mean about roof tiles ,especially any recommendations as to type and brands. It does amaze me how Thais put garish inappropriate darker colours up. Is it just ignorance? 

 

Man, this is a point of contention for a lot DIY guys building in Thailand. IMO, if you build here, build the "Thai Way" with local materials but in a foreigner design. Saves so much headache and everything is mostly understood. 

 

With this in mind, there are only 3 real types, tile, fiber type, and a metal type

 

The tile roof being the most expensive option and the most restrictive in room size. It requires a lot more roof steel for support, and on top of that, its hard to go over large spans with all that weight. There are ways around this but its just increasing cost. They are a heat sink, you can easily pry them up and get into someones house... The only good thing is aesthetics, and even that is us to the person. 

 

IMHO the best option is a colorbond roofing material, light, reflective, very durable, installed in a day, can span greater distances with less support steel, cools off as soon as the sun goes down.... On and on and on. 


The money saved going for a colorbond roof, can be put into 6" insulation and reflective sheeting under the metal and you end up with a better roof and insulation for about the same money as tile. Its cooler and better in just about every way. Some will say that its loud during the rain, but its not at all if you spend the money on insulation. Real insulation and you can barely hear the rain inside the house. 

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14 minutes ago, Psychic said:

I used an insulated white metal roof.

If I stick my head through the hole in the ceiling it actually feels much cooler than the top of the room where the heat accumulates.

So much so, that I am considering ceiling vents so that heat can escape.

 

Get ya some good ceiling fans to circulate that air especially if you use or plan to use air-conditioning. Will help draw in the cooler air from the outside as well. 

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Already in 1994 I used some insulation on the top of the roof, outside. Result: temp in the rooms just under the roof dropped from 54-55 C to 46-47 C

 

But a Thai who understands he / she has to INSULATE.... there are not many.

 

Ask www.miccell.com or www.miccell.co.th.

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"insulated white metal roof"

 

Why do white & silver metal like on a car heat up ?

Why does reflecting metale like bare aluminum and silver heat up in the sun ?

Why does a mirror heat up in the sun?

Reflective roof tiles ??

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