This gives new men to "Tree Hugger" Just don't forget to flash! hehe"703.3...Horizontal joints in panel siding shall be lapped a minimum of 1 inch or shall be flashed with Z-flashing."
"703.7 Masonry veneer, general...Flashing shall be installed over steel angle and a minimum of 6 inches under the wall sheathing."
"703.7.3 Flashing. Flashing shall be located beneath the first course of masonry above the finished ground level above the foundation wall or slab, and at other points of support, including structural floors, shelf angles and lintels when masonry veneers are designed in accordance with Section 703.7. See section 703.8 for additional requirements."
"703.8 Flashing. Approved corrosion - resistive flashing shall be provided at top and sides of all exterior window and door openings at top and sides of all exterior window and door openings in such a manner as to be leakproof, except that self- flashing windows having continuous lap of not less than 1-1/8 inches over the sheathing material around the perimeter of the opening, including corners, do not require additional flashing; jamb flashing may also be omitted when specifically approved by the building official. Similar flashings shall be installed at the intersection of chimneys or other masonry construction with frame or stucco walls, with projecting lips on both sides under stucco copings; under and at the ends of masonry, wood or metal copings and sills; continuously above all projecting wood trim; where exterior porches, decks or stairs attach to a wall or floor assembly of wood-frame construction; at wall and roof intersections."
"903.6 Side wall flashing. Flashing against a vertical sidewall shall be by the step-flashing method."
"903.7 Other flashing. Flashings against vertical front wall, as well as soil stack, vent pipe and chimney flashing, shall be applied according to asphalt shingle manufacturer's printed instructions.
"REROOFING...910.5 Flashing. Flashing shall be reconstructed in accordance with approved manufacturer's instructions.
There is one key word in all of this, "leakproof". If it leaks, it does not meet code! All of the rest is just how to make it leakproof. That being said let me share with you some things that I see which don't meet code and/or are not "leakproof". These issues are by no means limited to the problem builders they are everywhere, even on the best builders homes.
1. The code calls for flashing over steel lintels to be installed "6 inches under the wall sheathing." I have hardly ever seen this done. This is often the problem with water leaking at window headers.
2. There are some issues with installation of self-flashing windows and house wrap. To be "leakproof" the house wrap should be lapped over, not under the flanges on the top and sides of the windows, and under the flange at the bottom. Do it differently and water will get behind the house wrap and into the wall.
3. "Self-flashing" windows used in masonry walls confuse most builders. Just because the window is self flashing does not eliminate the requirement for support angle and brick sill flashing.
4. For a brick sill flashing to be "leakproof" the flashing must extend below the sill on a wood window and below the bottom flange of a "self-flashing" window.
5. In order for a window sill or support angle to be "leakproof" it must have "end dams". This is referred to in 703.8 with the words "at the ends of" but is not very clear. I have never seen an end dam used in residential construction and very rarely and only recently in commercial construction. To have an "end dam" the flashing must be shaped and turned up on the end in such a fashion to prevent water from leaking over the ends of the flashing. This is also recommend by professional to be installed at the end of all flashing applications such as at the top of openings or anywhere where water could leak over the end of the flashing.
For those of you who get upset when home inspectors write up existing homes for improper or lack of roof flashing, pay close attention to 910.5 above. When homes are re-roofed, they fall under the current code and must be flashed. Roofing mastic, irrelevant how thick, or beautifully applied is not flashing! It will in a short time crack out and leak.
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