There are many styles of canvas , that come in many weights . If you want to use an ultralight canvas , try a Linen (STRONG) or polyester material .
What’s wrong with using a lighter canvas ? Nothing at all !!! Most people here have been concerned with “puncture resistance" , yet nobody in these many years of foamie building has reported any punctures that we can recall . And given that information , consider that Fiberglass is not only Heavier , more expensive and more difficult to work with ( and Toxic for most people ) , but is more difficult to repair than canvas should you accidentally get a “ puncture” .
But don’t believe me , ask anybody that’s actually built one here.
It took years and many Foamie builds to qualify this information , so all may benefit from our experiences .
Ps. What we found is (JMHO) , most people who choose fiberglass want a smooth automotive type finish , and as some here will readily confirm , this takes a LOT of Labor to do so.
Canvas is still the best bang for the buck so far ( easiest too) … and just a personal opinion , I don’t believe those drop cloths are as good as a regular canvas material . Sure they have been used successfully , but will they stand the test of time ? And you can find all kinds of good canvas at places like Big Duck canvas, and they are always having sales …
We used 18 oz. (HEAVY) canvas on the FoamStream because we needed a reliable EVAC vehicle ( Our lives depending on it !!! ) and although more than Excessive , it’s sat
outside for ~ 3 years now awaiting duty, and has only required a
minimum of maintenance. Some work done as a design change . EASY !!! And as far as usual costs for camping on this level . ”CHEAP” !!
Best of all … No leaks !!! Inside still dry as toast !!!