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- D. John Henderson
Roofing/Expert Profile
Expertise
My 33 years in the building science business has involved air barriers, waterproofing, and flat & steep slope roofing systems.
Experience in the area
My roofing encompasses commercial systems (BUR, mod-bit, single-ply) and residential applications (asphalt shingles, cedar shingles, slate and metal. I am cognizant of code stipulations in regards to FM and UL for commercial roofs.
Education/Credentials
Attended numerous courses offerd by Roof Consultants Institute, Roofing Industry Educational Institute, Factory Mutual Research Corporation, University of Wisconsin, and BURSI. Lectured for RCI and mentored at a local university for a Building Science Certificate.
Past/Present Clients
Government, commercial businesses such as The GAP, hospitals, school boards as a roof designer.
What do you like about this subject?
Always learning something new as I can never say I know it all.
What do you still hope to achieve/learn in this field?
Share my roofing knowledge with those who will benefit from it.
Average Ratings
Recent Reviews from Users
K = Knowledgeability C = Clarity of Response P = Politeness| User | Date | K | C | P | Comments |
|---|---|---|---|---|---|
| liping sun | 05/05/12 | 10 | 10 | 10 | |
| Richard | 04/30/12 | 10 | 10 | 10 | I'll take more pics when it rains ..... |
| Sandra | 03/25/12 | 9 | 8 | 10 | |
| M Salazar | 12/13/11 | 10 | 10 | 10 | Thanks for your help :) |
| Andrew | 11/16/11 | 10 | 10 | 10 |
Recent Answers from D. John Henderson
2012-05-07 leaking roof:
I assume you mean between the exterior wall and the eave, commonly called the soffit. You have not mentioned when it leaks so I assume it is during rain storms. Flex Seal is a liquid rubber product
2012-04-28 Wet spot?:
The stain is at a joint in the plywood and regardless if it is sloped or a flat roof, the stain should be running down the joist if it is truly a water leak. Secondly being in Florida the warm temperatures
2012-04-17 Roofing interview questions:
10.) What type of roofing do you do-residential or commercial. 11.) Are you licensed as a roofer in your area. 12.) For residential work do you know the Part 9 Building code requirements -ventilation
2012-04-13 roll roofing:
Roll roofing is normally adhered to the substrate and at side laps with a cold adhesive. The membrane is terminated at least 12 inches up the slope (approximately under 3 shingle courses). with the
2012-04-11 Making a rooftop patio on an asphalt and gravel Roof:
A gravel roof is pretty durable because it is made of multiple plies of roofing felt and a covering of asphalt and gravel. To place a wood deck on top it can be done. Standard concrete pavers 2 foot x
Answers by Expert:
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