SOE Pathology

Question 1

What is cur edge corrosion

Answer 1

From the factory, steel roof sheets are finished in a plastic based coating system which protects the steel from corrosion. The sheets are then cut into sizes to be transported and installed on site. This leaves exposed ends to the sheets which are not protected from the weather. Once the roof sheets are installed, end, mid and side laps of the sheets are susceptible to moisture which is able to track beneath the coating through capillary action, and then begin to corrode the exposed metal to the sheet ends and laps. This causes the coating to peel, further exposing the unprotected metal to the elements, this then corrodes, and the process repeats itself. If left untreated the condition of the affected roof sheets will continue to deteriorate and can eventually lead to corrosion through the surface, allowing water ingress

Question 2

Why does metal rust

Answer 2

When metal is exposed to any type of moisture — even humidity in the air — the iron atoms in the metal react with the oxygen molecules in the air to form iron oxide, also known as rust

Question 3

How to treat cut edge corrosion?

Answer 3

Cut edge corrosion could be prevented by treating the cut edges with a protective coating system when the roof is installed, however in practice, this rarely happens. Depending on the extent of corrosion, cut edge corrosion can be treated with a liquid coating system. Methodologies and products differ slightly from each manufacturer. However in essence the process involves removing the corrosion and treating with an anti-corrosion primer. For a mid-laps, a gun applied sealant or butyl tape will be applied to seal the joints. The final coating will then be brush or roller applied to protect the cut edges from further corrosion. Most manufacturers offer at least a 10 year guarantee, making it a more cost effective option than re-roofing, particularly where a Tenant may only have a limited term remaining on their Lease.

Question 4

What is the

Question 5

What’re the issues with woodwool

Answer 5

When placing concrete against the wood wool soffit shutters, inadequate compaction of the concrete could occur due to the compressible nature of the board. This lack of compaction resulted in voids and honeycombing on the soffit of the slab sometimes leaving no cover to the reinforcing steel

Question 6

Types of single ply

Answer 6

EDPM
PVC