never heard of this before, but it shouldn't affect your fire insurance policy since you're not goign to install any sound insulation layer. the metal sheet is there only for waterproofing purposes

i guess you are using clay roof tiles. probably a J-profile tile.


for no.2, read my earlier post. clay tiles needs waterproof layer (in this case, metal sheet is the cheapest and easiest and last longest)

AND REGARDING PITCH ; it doesn't matter what degree your pitch is. it depends on the type of roofing material and profile

if you use seamless metal sheet with klip lok profie, you can go as low as 4(deg)
if you use tiled rooginf, it's recommended to be at 25(deg)
as long as you don't go below 5(deg), you should be ok. lower than that, then consider reinforced concrete flat roof (major headache)

the only reason why pitch is extra important is in 4-season country where high roof pitch is needed so snow won't settle on the roof. snow = extra weight and will make your roof collapse

learn more. roof pitch has nothing to do with sunlight. it's either snow or roof design or just for styling,

for no 3, you still need the chicken wire netting. if not, how will you put the rock wool? u surely needs something to support the rock wool and that's why the chickn netting is there

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Added on September 27, 2007, 1:50 pmthat's what they used to call it. it's more like a generic term. galvanization is kinda old. it's more to "aluminization" nowadays

it's not in coil, but in metal sheet rolls of standard width and infinite length

the roof profile is cold-formed using pressing machine.

This post has been edited by lucifah: Sep 27 2007, 01:55 PM

GI is not old. they are just another type of steel sheet. your aluminization is call Hot Dip Galvanised 55% Aluminium Zink in coils. 'metal sheet in roll' aint we call it coils?

metal sheet width never in standard, as they depands on what profile r u selling. (depand on machine also).

i do not noe whether ab d clay tiles its a commom practice or not, but for hip area(which is more prone to water sippin into d house), contractor use "oil paper'...


yar.. u rright ab ab d metal sheet roofin... it can go to vry low pitch

errr... all these while i was talkin ab clay/concrete roof tiles., so pitch cannot lower than 18degree to avoid water goin into d house...


i do not noe, but from renovation / rebuidlin houses that i hav encounter, some contractor do not use rockwool(so no need chicken nettin). they jus lay a layer of insulation aluminium foil...



TS, i think its a commom practice here to use any type of insulation but i cant confirm u whether it will avoid fire insurance...

these kind of metal sheet under the roof tiles, other than the purposes that u all mentioned, is it serve as theft prevention as well?

any idea of the price for

PVC Roofing Sheet - will crack after 5 years ?
Metal Roofing Sheet - too hot ?
Alum/Mix Roofing Sheet - is it very expensive ? sounds hi-tech

price per sq with installation

my area size is 60 X 90. (mini warehouse)

pros and cons

Today one of my contractor highlighted this to me, but from this treat I didn't see the outcome whether it do void the insurance.

The main question is "If lay Zink sheet under the roof tile, will this again insurance policy?"

why don't u just call and insurance fella and ask him la...

Haha...According to the insuance company (MNI) it is OK and not void if lay Zink...
Can Trust kah?

don't understand the logic of void the insurance just by placing a zinc sheet below the concrete roof tiles.

As for placing the rockwool under the metal roofing sheets like the zincalume sheets, these are normal in factories what...