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zeekgarcia

stop attic heat coming down into the house

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Posted (edited)

Have a single story house about 130 sq meters during the hot months the heat from the attic/roof space comes down into the house and it is like an oven. We do not have a/c and keep our windows and doors open.  I am attaching a photo of our roof and more details about it below.

 

I was thinking of getting the SCG stay cool insulation and having it put on top of the ceilings but I read this post about the SCG insulation blocking the heat in the house from rising up into the attic/roof space and they had to install fans in their rooms to blow the hot air from their rooms into the roof space.

 

So I am not sure about what to do now and am looking for suggestions.

 

**More details about our roof**

The roofing of the house is not the cpac clay roofing tiles but it is the common long roofing sheets, I peaked my head into the roof space and saw one gable vent on the far right hand end of the roof which I drew a small blue circle around on the attached picture.

 

The large blue circled area is a downward ridge, where two downward sections of the roof meets and goes downwards from the highest part of the roof, I did see some sunlight along this ridge so I am guessing that air can come in or out of these areas but there are no signs of leaks or water coming in etc

 

The black circled part is an addition that was added onto the house and there is a few cm of space between the roof and the room ceiling.

The whited out part is the neighbors roof, our roofs are just a few cm away from each other.

google view of roof.JPG

Edited by zeekgarcia

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Posted (edited)
6 minutes ago, Naam said:

the first step you need is not some tech rubbish² (designed by "thermophysical" ignorants as described above) but a proper ventilation (preferably forced) of your attic.

 

Are you talking about attic vents or maybe putting a fan at the gable vent? 

Edited by zeekgarcia

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13 minutes ago, Naam said:

the first step you need is not some tech rubbish² (designed by "thermophysical" ignorants as described above) but a proper ventilation (preferably forced) of your attic.

Would the whirly-gig things work, either powered or not please?

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10 minutes ago, zeekgarcia said:

Are you talking about attic vents or maybe putting a fan at the gable vent? 

fan at gable vent. make sure there's enough intake on the other end. perhaps you have to make an intake in the eaves. your description is not clear.

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Posted (edited)
27 minutes ago, Naam said:

fan at gable vent. make sure there's enough intake on the other end. perhaps you have to make an intake in the eaves. your description is not clear.

are these attic vents with fans in them, what you are talking about?

Does anyone know of anywhere that sells anything like these here in Thailand?

And could you use them with the standard cement roof panels like the red one below

 

Thanks

attic vents.JPG

roof panel.JPG

Edited by zeekgarcia

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 installing a passive (non-powered) whirly gig does not by itself actually do anything

(I'm totally in concurrance with @Naam on this) Any air rising up through a whirly, is only doing it due to convection. 

so, if you have, say, already bought a whirly gig, ; then it'd be better to now go buy a ceiling extractor like fan , to ensure air gets forced up through the whirly...

Another alternative, is the Bell type venting.  This concept  is no better for simple convection; however these are all powered

image.jpeg.f54663e38adb00ee94e4e8c9bd843d29.jpegThese are supplied with a 12 volt based thermostat.

the major other advantage of these, is that it is weatherproof... something a whirly cannot guaranteed against.

 

 

 

 

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This is a repeat of a similar current post that is running, look for it and have a read. 

Idealy the first place to attach the problem is directly under the roof with reflective aluminium foil, get that right and you have a better chance of getting the house a bit cooler with insulation. 

 

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Discussed here.......

 

 

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17 minutes ago, zeekgarcia said:

are these attic vents with fans in them, what you are talking about?

Does anyone know of anywhere that sells anything like these here in Thailand?

And could you use them with the standard cement roof panels like the red one below

 

Thanks

attic vents.JPG

roof panel.JPG

heh heh heh  - like minds thinking alike!! 

Note,  that the bell vent in your photo that you found, hasn't been installed correctly. 

It's downtube, needs rotational adjustment, to counter the angle of the roof.

It is only capable of retaining it's weatherproofing  guarantees, up to 15 degrees from level.

yes the bells are powered...a 12volt 18Watt motor; contolled via a kit-supplied thermostat.

 

 

 

 

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Posted (edited)

I would shy away from anything the needs a hole in the roof as you may  create a water problem... I would add a fan to the gable like this...

 

images.jpeg

Edited by sfokevin
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33 minutes ago, zeekgarcia said:

are these attic vents with fans in them, what you are talking about?

Does anyone know of anywhere that sells anything like these here in Thailand?

And could you use them with the standard cement roof panels like the red one below

 

Thanks

attic vents.JPG

roof panel.JPG

a whirly is easily installed in your corrugated sheets as it comes with a fiiting attachment. but as mentioned... no breeze = hardly any ventilation ventilation. airflow intake is required too!

 

the pictures show roof fans which to the best of my knowledge are not available in Thailand. i installed half a dozen temperature controlled in our Florida home.

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Another approach is a “whole house fan” that exhausts to the attic, plus gable vents (non-powered), since you keep windows and doors open. Bigger is better, and adjustable speed is your friend. 

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