Some rough measurements for you.
5.4m: Garage length (internal dimension taken)
15cm: Rise
According to online pitch calculators, this equates to roughly 3 degree pitch? The existing roofing is concrete sheets, supported by joists every 85cm. I had hoped to arrange replacement with something like this (leaving existing wooden structure in place), however although designed for lower pitched roofs it still has a minimum of 5 degrees. Would it work if additional supports were introduced between existing joists, or is the pitch too low to allow for sufficient rain runoff?
Onduline - Black Corrugated Bitumen Roof Sheet (2000 x 950mm) (roofingmegastore.co.uk)
Existing sheets are now failing in terms of water ingress, however I want to find a cost effective replacement solution as the garage is only used for storage and I'll likely be moving in a few years so don't need a tier 1 system. Some pics below. Even for the original install, a rise of just 15cm seems very low?
5.4m: Garage length (internal dimension taken)
15cm: Rise
According to online pitch calculators, this equates to roughly 3 degree pitch? The existing roofing is concrete sheets, supported by joists every 85cm. I had hoped to arrange replacement with something like this (leaving existing wooden structure in place), however although designed for lower pitched roofs it still has a minimum of 5 degrees. Would it work if additional supports were introduced between existing joists, or is the pitch too low to allow for sufficient rain runoff?
Onduline - Black Corrugated Bitumen Roof Sheet (2000 x 950mm) (roofingmegastore.co.uk)
Existing sheets are now failing in terms of water ingress, however I want to find a cost effective replacement solution as the garage is only used for storage and I'll likely be moving in a few years so don't need a tier 1 system. Some pics below. Even for the original install, a rise of just 15cm seems very low?