Does roof insulation really work against heat?

[welscua]

When you install roof insulation makesure that it is securely press against the roof by small dia chicken wire so it will also be protected from those pesky birds in case you have small external openings/cracks in your ceiling.. and your interior ceiling should be sealed to prevent fiberglass from being inhaled by occupants.

[NeoAnderson88]

Radiant Heat Barrier and Reflective Foil Insulators

Are radiant heat barrier and reflective foil insulators like Enerflex, AtticFoil, RadiantGuard available in the Philippines? Any feedback or opinions on these? Has anyone tried these?

http://www.ufpi.com/product/enerflex/faq.htm

http://www.atticfoil.com/

http://www.radiantguard.com/

TIA

[agave]

I think Insulite Airofoam is the most well-known and made in Philippines. (They have a website.) Any other good quality brands besides them? How do the Chinese brands compare?

We put this in but do not have any hard data on how effective it is.

If only there were more hard/actual data to compare:
white roof without radiant barrier
white roof with radiant barrier
white 'ceramic' painted roof without radiant barrier
white 'ceramic' painted roof with radiant barrier

will insulation help? yes, a lot.
disadvantage? pag may tulo yung bubong, di mo mahahanap kaagad.

Agree. Common roof here seems to be metal and usual installation method seems to be Tek screws with rubber gasket and sealant applied to screw before driving it in. This seems to be the weak link, Achilles heel, where leaks usually start.

With radiant barrier, you have no idea which of the bazillion Tek screws need their regular dose of additional sealant.

[alistairdapo]

Thanks, guys, for your reactions.




I talked with a small time contractor who told me that what he would do is to pull up the GI sheets from the roof to install the insulation layers to be directly located below the GI roof. He told me that's the way to install insulation layers on an already built up roof, same also with a roof being set on top a house on construction phase.

Placing the insulation on the inner surface of ceiling is what I thought should be the way to insulate a house already built up, from heat coming in through the roof.

Decreasing a warehouse with that kind of insulation from heat build-up by five degrees Celsius, that is a big reduction.

I think it is the better way to insulate the house from heat coming through the roof, specially considering that pulling up the GI sheets and returning them back is certainly going to disturb the water-proofing of the roof, because the GI sheet will be pierced with more holes than the original ones at the beginning, meaning more trouble from leaks, wherefore more application of vulcan sealant.

Hi I usually see Foremans do this type of intallion. I just wanted to ask you think if it would be effictive to follow this method (pulling up G.I sheets and putting them back) then apply vulca seal and then repaint with boysen roofguard? Oh also for our tyoe of weather which is better single side or double sided reflective insulation? thanks

[Go_To_Guy]

Hi I usually see Foremans do this type of intallion. I just wanted to ask you think if it would be effictive to follow this method (pulling up G.I sheets and putting them back) then apply vulca seal and then repaint with boysen roofguard? Oh also for our tyoe of weather which is better single side or double sided reflective insulation? thanks

It's never wise to remove and replace the GI sheets. It will never be the same again and could even be worse. The thicker the better for some insulation regardless if it has two sided foils. It's also better to install gypsum board for the ceiling for it can provide the same amount of insulation as the same foam of it's thickness. Have the maximum amount of eaves vents too.

[dvayne]

Yes.

In the 90s we rented an old warehouse in the which we operated as a factory for a labor-intensive manufacturing operation. It had a GI roof and a ceiling made of 1/4" plywood. There was a space of about 24" between the ceiling and the roof.

We decided to install 2.5" thick fiberglass wool insulation with metal foil on one side, laid above the ceiling (not attached to the roof as is usually done). We achieved an indoor temperature reduction of up to 5 degrees Celsius at the second floor, before air conditioning.

kuya danny, saan po ba makakabili ng 2.5" thick fiberglass wool insulation with metal foil on one side?

[Azulbanirpal]

It's never wise to remove and replace the GI sheets. It will never be the same again and could even be worse. The thicker the better for some insulation regardless if it has two sided foils. It's also better to install gypsum board for the ceiling for it can provide the same amount of insulation as the same foam of it's thickness. Have the maximum amount of eaves vents too.

Yup, I agree with this, there should be some venting on eaves to also remove hot air in roof chamber.

Also air con should be the last resort in cooling your house. Work on insulation and ventilation first.

[cyberfunk]

I think I said this before from another thread. Insulation works both ways. To keep temperature from coming in or to keep it inside. Here we have to subscribe to tropical design. To keep the heat from coming in and to provide passive cooling inside. If you don't have passive cooling then refrigeration comes into play with air conditioners. With that you need to keep the cold temperature inside.

[Azulbanirpal]

Venting of roof should be done regardless of presence of insulation or none. Even with a good insulation barrier there would still be heat transmitted. Then the ceiling acts as a barrier for air conditioned rooms below.

Personally I dould not want to use air conditioning all the time, perhaps only on hot days in the summer and only in the middle of the day and early afternoon.

[bahaykubongputi]

tanong ko lang mga boss. ano kaibahan ng single foil at double foil aluminum insulation. would there be difference between the two as far as reflecting radiant heat from the roof is concerned?

balak ko kasi ikabit ay single foil single bubble real aluminum na insulation. ok na ba to? thanks!

[xctrekker]

What is the best insulation material to use on roof of corrugated GI sheets, in terms of cost and efficiency?

What is the best way to install the material and where in an already built up roof? (attached to the underside of the roof sheeting or on the attic side of the ceiling, or where and how) in terms of cost in material and labor, and as regards to labor time?

How long does an insulation material last before it becomes useless or loses much of its efficiency?


Any suggestions how to cool down the house aside from insulating the roof or the ceiling?


Susmariosep

Kung nakakabit na yung GI roof, syempre mas tipid kung dun sa attic side na lang ng ceiling ilatag yung foam+foil insulation. Assuming of course, na wala ka pang kisame.

Kung may kisame na, I would prefer na yung kisame na lang ang galawin. Kung horizontal, suspended ceiling ka, medyo madali siguro- baka pwedeng gapangin sa loob in sections para mailatag yung insulation.

Kung vaulted ceiling naman, no choice but to dismantle yung whole ceiling.

Between the two ceiling designs, I still prefer yung vaulted. Yung horizontal suspended ceilings kasi nag-iipon ng maraming mainit na hangin sa loob pag summer. Yung darang nun ang nararamdaman mo sa loob ng kwarto.

Kung CHB yung walls mo, you can also cool down your house by cladding it with PVC, fiber cement, aluminum panels/sidings designed for the purpose. Between that and the CHB wall, you can put insulation to hamper heat transmission.

[dvayne]

Kung nakakabit na yung GI roof, syempre mas tipid kung dun sa attic side na lang ng ceiling ilatag yung foam+foil insulation. Assuming of course, na wala ka pang kisame.

Kung may kisame na, I would prefer na yung kisame na lang ang galawin. Kung horizontal, suspended ceiling ka, medyo madali siguro- baka pwedeng gapangin sa loob in sections para mailatag yung insulation.

Kung vaulted ceiling naman, no choice but to dismantle yung whole ceiling.

Between the two ceiling designs, I still prefer yung vaulted. Yung horizontal suspended ceilings kasi nag-iipon ng maraming mainit na hangin sa loob pag summer. Yung darang nun ang nararamdaman mo sa loob ng kwarto.

Kung CHB yung walls mo, you can also cool down your house by cladding it with PVC, fiber cement, aluminum panels/sidings designed for the purpose. Between that and the CHB wall, you can put insulation to hamper heat transmission.

ano po pinagkaiba ng horizontal, suspended ceiling at vaulted ceiling? papost naman ng pictures.

[xctrekker]

ano po pinagkaiba ng horizontal, suspended ceiling at vaulted ceiling? papost naman ng pictures.

I made an error- I said vaulted when what I had in mind was cathedral ceiling. Anyway, imagine a simple A-frame house.

Horizontal suspended ceilings have their frames laid out horizontally usually about 9 feet from the floor, from corner to corner (or edge to edge, if you prefer) of a room. Ito ang typical ceiling for many homes dito. Pantay lang yung height & horizontal all through out yung kisame.

Pag cathedral, sumusunod yun slope ng ceiling sa slope ng roof. Yung frame ng ceiling usually nakakabit sa trusses ng roof. Vaulted ceilings are also not horizontal but unlike cathedral ceilings, they do not fully follow slope of the roof- pwedeng mas mababaw yun angle ng slope nya.

Hope this helps. Can't post pics- low tech po kasi ako, ha-ha.

[ChenesKayo]

uhm, if ikakabit yung one sided foil na Airofoam sa kisame ok na ba yun? Di naman sa loob ng bubong so kailangan pa ba ng air space?

Dapat ba yung foil side yung idikit sa kisame or yung foam side para effective at lumamig yung kwarto?

[ChenesKayo]

well anyway, nagpakabit na ako nung May and so far so good! hindi na talaga mainit! oh yeah!~

[gotta lick it]

oo nga, does it really work? i seldom notice the difference because it often gets covered by the ceiling. maybe if, one has an attic it would be obvious.







OnT: medyo confused with this material because there are too many hearsays from suppliers, contractors, and designers.
which is the most effective installation for double foiled foam r-14.5 insulation sheets: above or below the purlins? and why?

[ChenesKayo]

oo nga, does it really work? i seldom notice the difference because it often gets covered by the ceiling. maybe if, one has an attic it would be obvious.

well in my case kase hindi na pwede ilagay sa loob ng bubong so dinikit na lang sa kisame and so far it's way better than before. super.

[shotokan]

well in my case kase hindi na pwede ilagay sa loob ng bubong so dinikit na lang sa kisame and so far it's way better than before. super.

hi, pwede ko ba malaman kung anong brand ang ikinabit mong heat insulator, at kung magkano ang inabot mong gastos? gaano kalaki yung pinalagyan mo ng insulation.

just getting some ideas... plano ko rin kasi magpalagay pagbakasyon ko this december.

for my case, nakakabit na po ang roof pati ang wooden ceiling frames. isa pa lang ang nalalagyan ng ceiling, sa may master bedroom so what way ang best na pag install ng heat insulators? pwede kayang ilatag lang sa ceiling wooden frame?

any inputs will be appreciated...

thanks,,,

[ChenesKayo]

Airofoam yun, one sided lang, ndi yung double sided. Mga 1k+ kase mga 10ft by 11ft yung rm ko. Tas pinapako ko lang sa karpintero so plus yung bayad sa karpintero. gnun lang, balak ko patungan ng white vinyl sticker para hindi makintab yung kisame kaso hindi ko n nagawa. haha~

as for your concern it looks like magpapakabit ka nun sa loob ng ceiling... not sure how you should do that. nag-research ako online dati, you need to put some space or something para sa air... tpos saka mo lagyan ng insulator. basa-basa ka rin online. =)

[j0ystick]

^san po nakakabili ng airofoam? yun ba yun silver at foam na magkabilaan?