There are soft spots in the flat roof.
Is particle board used on roofs.
Particle board in modern homes is required to be visibly marked as astm type 2 m w.
Like particle board and mdf osb comes from wood shavings.
Oriented strand board commonly referred to as osb is a type of engineered lumber similar to particle board formed by adding adhesives and then compressing layers of wood strands.
Osb is widely used as roof decking material.
Wood veneer particle boards are very extensively used in this industry.
However with osb the layers are more cross oriented.
We form the layers by shredding wood and then joining them together with adhesive.
Particle board comes in several thicknesses which make it a versatile enough product to be used in roofing.
Uses of particle board in commercial industry.
It has this particle board for the roof my dad the smartest man i have ever known said particle board is actually illegal but it was alot cheaper so he did the shed with particle board inside of plywood.
If not of a type approved for use as roof sheathing particle board strength and stability when exposed to moisture is significantly lower than that of plywood or oriented strand board osb more commonly used for this application.
This is especially common on a low slope roof.
Although oriented stranded board osb has similar uses to plywood it has a much coarser finish.
Treated lumber is often used as the main material with thin sheets of treated particle board being placed on top and then shingles are attached.