MGA wrote:
do any of you know how much (roughly) would it cost to change
the roof of an asbestos garage to a flat one? Is it worth doing
this or would it just be better to build a new garage from
scracht? It's a simple brick garage separated from the house.

Is it a pitched roof or a flat (ish) (corrugated?) asbestos
cement one? I recently converted a garage roof from flattish
to pitched. Procedu Remove steel edgings and corrugated
sheets (use a bolt cutter to snip the bolts or split the
nuts). Dispose of sheeting at tidy tip. Affix 4x2 timbers
to top of sides of garage (scarf joint in middle of each
side nailed is OK). Affix four 4x2 cross-members, one 2"
from each end, two equally spaced towards the middle. Cut
4x2 rafters and fix to cross-members and ridge board. Nail
on 2x2 battens lenghtwise. Cover roof with 1/2" Stirling
OSB. Buy corrugated iron, cut to length with angle grinder,
fic to roof (cut end at ridge) ensuring a corrugation
overhangs the edge of the Stirling board, and that enough
length protudes at bottom of sheet to shiels Stirling
board grom rain, & reach to gutters. Nail shiplap to ends.
Cut old steel edgings to weatherproof the bottom of each
shiplap end. Nail treated tiling batten under end overlaps
of corrugated iron, and nail over 100mm weatherboard pushed
up into trough of corrugated iron. Nail shiplap along sides
to seal. So:

4x2: 2 lengths of garage + 4x (width of garage + 8") + 8
rafter lengths.

2x2: 8x length of garage.

4x1: 1x length of garage.

Stirling board: Enough 8'x4' sheets

Corrugated iron: Enough sheets allowing for overlap (it may
be a good idea to select sheet length of say 5' and build
the roof to that dimension to save cutting).

Galvanised ridge pieces:4

Nails 4" bright, 2" galvanised clouts, spiral nails+washers+
caps for securing corrugated.


I don't know what prices are where you buy, but that will
give an indication. Guttering if you want it (on garden side
especially) to be added. Grunff says use square section
corrugated - I think this looks awful on a small building
like a garage. As an alternative to corrugated iron, you
could use Onduline (pitch polymer corrugated sheet) and
then you would probably be able to dispense with the
Stirling OSB which is to prevent condensation problems
with the corrugated iron.


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