This represents good blocking. Old and new. The Redskins could learn a lot here!
The purpose of blocking is to prevent movement - in all sorts of contexts. And good blocking prevents movement no matter what. Would that all football teams understood that, but I digress.
This first photo shows the efforts of some diligent soul trying to make his house more comfortable and added insulation.
IT IS THE RIGHT IDEA! HIS THINKING WAS EXACTLY CORRECT. DOING THIS IS A CHEAP AND PERMANENT MEANS OF ADDING ENERGY SAVINGS TO THE HOUSE.
Houses, however, are systems, with things that work together, interacting for good or for bad.
In this case, by adding the insulation the way he did, he blocked all air flow from the soffit vents.
Consequently, with no air flow condensation builds up over time. You might notice the staining on the wood sheathing, and around the rusting nails.
There are even little water droplets on some of the nails. I could wet my finger and show my client, looking from the top of the ladder. This is the necessary result of no air flow. This all began when the homeowner installed the new insulation. He did not account for air flow, and inadvertently caused this problem.
Solving one problem (an uncomfortable upstairs level summer and winter) he caused another.
This photo is brand new construction.
A professional insulation installer has done virtually the same thing.
HE SHOULD KNOW BETTER. HE IS SUPPOSED TO BE A PROFESSIONAL.
Uncaring, or ignorant, he blew fiberglass insulation all the way to the edge of the roof such that it blocks baffles there installed to admit air from the soffit vents.
There is so much insulation blown into that baffle it has actually pulled the cardboard away from the wood as the staples have given way.
Done properly no venting system works as well as the soffit and ridge system. It is pure physics. Air is encouraged in through the soffit vents, and high pressure seeks low, rising to exit the ridge vent. Thermal convection also plays a role as the hotter the air gets the faster it rises toward cooler air (heat seeks cold).
It is pure physics.
IF, THAT IS, AIR CAN FLOW. IF THERE IS NO AIR FLOW THE PHYSICS IS STULTIFIED.
And this problem would have been a problem for years to come. And nobody would be the wiser.
EXCEPT THESE WISE HOMEOWNERS WHO HIRED A HOME INSPECTOR
TO DO A FINAL WALK THROUGH!
Now the work begins. Make it right!
My recommendation: you never know what will be found on a final walk through home inspection of new construction! And hopefully (rarely) nothing will be found! In that case you have paid for peace of mind. And peace of mind is work a million bucks, as they say. Correcting issues that are found also represents peace of mind! And while that may also be worth a million bucks, it does not cost a million bucks to hire a diligent home inspector...
Jay Markanich Real Estate Inspections, LLC
Based in Bristow, serving all of Northern Virginia.
Office (703) 330-6388 Cell (703) 585-7560