A roof is a covering over a structure and without a water shedding membrane applied.... YUP!

You have water entering the structure.

Unless the roof itself has some type of continuous membrane applied, your roof is not water proof. This type of roof membrane is usually applied to flat or very low slope roofs. Typically some type of shingle, either of asphalt/ fiberglass composite, metal panels, or interlocking metal shingles. These types of roof are not water proof, they are applied so as water flows from upper single or panel to onto lower shingle or panel until reaching lower edge of roof all the way along the lower edge of the roof, there must be a layer ice and water shield applied prior to installing roofing membrane.

This is to prevent the water buildup from ice damming entering under shingles. Any change in direction of roof must be flashed which prevents water entering under roofing. Big Block inspections always applies a layer of 30 lb. roofing felt upon the roof sheathing and either attaches with staples of large headed nails.

I believe this gives the shingle nails a cushion between wood sheathing and roof membrane, in case aircircultion through vents is minimal and the roof sheathing swells and contracts due to poor air ventilation 30 lb, roofing felt is inexpensive why risk nail popping. Where roof water exited or runs off eave and there is a wall adjacent, use a couple of kick outs to direct water away from wall and into gutter.

Always have at least three contractors bid on the roof, fully explain their methods in writing and type plus quality of roof membrane to be used.(In fully explained writting and samples)

Watch these roofers install, ask why this and why that. Micro manage. "You are the boss and you write the checks." Don't take the answer..."Ahh we always do it this way" do it right do it once.

Never add another layer of shingles over an existing old layer. Remove existing layer and repair any structural and or sheathing problems, prior to re- roofing. Be sure roofers clean up there mess, as shingle nail in foot is very painful.

Last item, many roofing contractors will contract to you and hire very poor quality roofers, you don't like the crew. GET RID OF THEM!!!!

Either call or email Big Block inspections with any questions.

David Palmer is the owner of Big Block Home Inspections and is an expert in home inspections in the Barrie Area. He has built, renovated and inspected structures for the last 45 years.