The crew finished out last week by completing the roof shingles and sheathing on the house and garage. This was a large undertaking and our entire crew worked hard to get it all done.
The first part of the roof is the sheathing of 5/8” OSB. As discussed in a previous post, OSB is an engineered wood particle board formed by layering strands (flakes) of wood in specific orientations. It has a rough, variegated surface with the individual strips lying unevenly across each other.
After the sheathing, we added an aluminum drip edge that directs water run-off from the roof. This forces the water to run toward the rain gutters.
Next, we add two rows of ice and water shield. Ice and water shield helps prevent wind-driven rain from leaking through the roof deck, or melting ice and snow (caused by ice dams in harsh winter climates) from leaking into property’s interior.
Wilkins Contracting no longer uses builders felt, which would normally be applied next. We now use synthetic UDL (Underlayment) that is applied using button cap nails. Synthetic UDL is warranted to protect the roof for 6 months or more without shingles. Then, once the shingles are applied, it provides a second line of defense against water leakage.
So, after the UDL is applied, we added the shingles. We used an architectural shingle that is warranted for 30 years or more.
The top of the roof also has a Vent-A-Ridge, also known as a shingle-over ridge vent. When the sheathing is added, a space is left at the top to provide exhaust and allow air to ventilate the underside of the roof. These roof decks are fire rated in accordance with UL standards for ICC approval. They are the only externally baffled Class A fire-rated shingle-over ridge vents available. Design features include an external baffle and internal weather filter for optimum airflow and weather protection.
An additional item that is added where necessary is flashing and counter flashing. This is added in locations where the roof-line meets another vertical wall. Roof flashing is placed around discontinuities or objects which protrude from the roof of a building (such as pipes and chimneys or the edges of other roofs) to deflect water away from seams or joints and in valleys where the runoff is concentrated.
While completing the roof, roof boots were added to accommodate DWV (drain waste vent) or venting for plumbing. This is installed to ensure that plumbing has the proper venting to work correctly.
Next, we will be installing windows and doors. Stay tuned for our next post.