roofing iron pros/cons

[zongatron]

A couple of questions,

cliplock costs more, do you guys think its justified? and what are the benefits except less screws...

if I was going to redo the roof with standard colorbond (corrugated)... it comes in .42 and .48 i think...
is there going to be any problems with the thinner cheaper sheets?

If my roof is flat except it has a 60mm rise in the centre then falls down on the other side ( so gutters on each length side of roof.... new iron wouldnt need to be prefab rolled would it? Thatd be overkill wouldnt it?

ta

[Make it work]

The 60mm rise is over what distance? Corry, infact all metal roofing has a minimum fall to adequately drain water away and that sounds like it could be way below the minimum.

Also is there a ridge cap at the top?

[zongatron]

hi
very possible it isnt legal. House has been here for about twentyfive years / remote location etc
no ridgecap, its about a 9m length of iron which simply has higher battens in the centre of the roof hence the fall.
A bit like the harbour bridge, but real low if you follow, just a slight roll from one side to the other
No problems in 20 years though...no leaks and we gets heaps of rain sometimes...

[ian]

some considerations for you.
Lysaght's recommended slope for different roof profiles:
1 in 12 (5°) Corrugated iron
1 in 20 (3°) Spandek Hi-ten
1 in 30 (2°) Trimdeck Hi-Ten, 0.47mm thick Klip-Lok
1 in 50 (1°) 0.53 and 0.65mm thick Klip-Lok

so there is one reason to use the heavier gauge Klip-Lok, it'll go on a flatter slope

a second reason is that the supports can be further apart for the heavier gauge steel
Using Klip-Lok as an example internal spans can be 2.7m for 0.65 sheet, 2.1m for 0.53mm and 1.3m for 0.47mm
if you opt for corrugated iron, internal spans are limited to 1.2m for 0.47mm sheet and 1.6M for 0.53mm sheet
— how far apart are the rows of screws on your roof?

a third reason is eaves overhang can be greater with the thicker shets

a fourth reason is the ability of the roof to support and shed water when it rains really really really heavily. Each roofing profile has a different characteristic. Corrugated iron will leak once the water depth exceeds about 16mm, with Klip-Lok the water depth needs to exceed about 40mm — hence the steeper slope required for corugated iron


confused?

[zongatron]

nope.
beautiful answer