Ahh I see you have sought another method Max

Re: Roll on roofing
Asked by Maxpower

Question:
All right, part two to my last question.  I've got the OSB on, and now its time to lay down some 15lb. felt, and roll on roofing.  My question is has anyone ever used roll on?  I'm told it will be difficult to deal with being cold out.  I've also heard varying amounts of overlap between rows.

My Advice:

First of all, I want you to make sure what the pitch of your roof is.  With rolled roofing materials I would not apply it to a roof that has a pitch of less than 2" to a foot slope.  Some of the manufacturers will actually void warranties on a slight slope of this.  In case you are wondering how to check the slope of your roof get a 2 foot level and measure out one foot and marak a line.  Then take and hold the level with the corner of the level on the roof and then measure from the line down to the roof and whatever that measurement is is the inch slope.  If it is les than 2" I would not use the rolled roofing ( I know as an electrician you probably know how to do this but I did it for others that might find this posting).

If that slope is less than 2" I would apply shingles and I know that this was the origionator of your dillema.

Next ensure the substrate is dry and  properly installed and conditioned roof deck constructed of exterior type plywood, minimum thickness of 3/8". Alternatively 7/16" thickness APA rated non-veneer structured panel may be used. Pieces of tin or other suitable metal should be nailed over all knot holes and large cracks. If sheet metal is not available, pieces of this rolled roofing may be used. The roof deck should be swept clean of all dirt and loose materials.  Ensure that adequate ventilation under the roof deck is provided to prevent harmful condensation in winter and heat build-up in summer.  Also, do not apply insulation to the underside of deck but rather properly insulate the attic space if this is over a heated space.

If this roofing will be applied in a cold climate, rolls of roofing should be placed in a warm place for 24 hours prior to application.  Cut the roll into two 18´ lengths or three 12´ lengths and place in a warm area (>50 degrees F) for 24 hours prior to application. Then loosely re-roll the sheets the reverse way. The roofing should be drawn up tightly during application. Wrinkles should be pulled out during final fastening.

NOTE: EXCESSIVE USE OF CEMENT ON ROLL ROOFING WILL CAUSE BLISTERING OF THESE PRODUCTS. DO NOT CEMENT ROLL ROOFING DIRECTLY TO ROOF DECK SURFACES. CEMENT ONLY THE LAPS!

When I do the laps I lap the side laps 2" and cement with asphalt-based roofing cement and nail 3" in a line 3/4" back from the edges of the sheets. I lap the end laps 6" and secure with cement and two rows of nails, the first row 3/4" and the second row 1-3/4" from the edge. I space nails 3" apart and stagger the two rows. On horizontal application  I  nail from center of sheet towards ends; in vertical application (which I avoid if I can), I nail down from top of sheet. Coat nail heads with cement. Finish edges of roof by continuing roofing sheets 1/4" beyond the ends of the roof deck to form a drip edge and nail carefully. Be sure all laps are thoroughly cemented at all points. Carefully roll down edges of all laps.

!!THE CAUTIONS!!

CAUTION! SLIPPERY WHEN WET

CAUTION!  Do not walk on surfaces unless it is completely dry. Follow proper safety practices, including using appropriate shoes and safety rope.

CAUTION! KEEP ROLLS DRY AND COMPLETELY PROTECTED FROM THE WEATHER.

I hope this helps.  Good luck and if you need anything else don't hesitate to ask.  Again be careful and remember that foolish pride can be the end all of the project and worse off you.  I again do not intend to go against the general nature of this site as I beleive that most people can do most projects with the right guidance and information I just want them to know that htis is not a lace for errors as there are structural concerns and also life safety concerns.  IT is admirable to do these projects but then when it is pouring rain outside and inside your home the emergency charge for bringing out the professionals at 10:00pm on Sunday night will probably pay for their straight labor when it is dry and sunny on Monday morning.

Happy Refurbing!