How to calculate roof ventilation guidelines:
Industry Standard for Proper Ventilation: 1 sq. ft. of ventilation for every 300 sq. ft. of attic space with 50% in ridge and 50% in soffit. Total ventilation 12.228 sq. in. per lineal foot—Net Free Ventilation
Ex. – 2000 square ft attic space:
- 40′ x 50′ = 2,000 sq. ft. attic.
- 2000 sq. ft./300 sq. ft. = 6.67 sq. ft. (total ventilation req.)
- 6.67 x 144 = 960 sq. in. (conversion to inches)
- 960 sq. in. = 480 sq. in. (ridge) + 480 sq. in. (soffit)
How your contractor should install a roof turret:
Turrets and cones need custom cut shingles which change depending on the radius and pitch. They can be quite difficult to install; time and care must be taken during installation.
- Determine the taper by chalking lines originating at the peak, extending to eve spaced 11-5/8″ apart (the width of one shingle)
- Place the shingle at the eve between the 2 lines, this will give you the proper taper for the first course
- Mark up from the top of your first tile your exposure. Repeat until you reach the top of the turret.
- Each course will have a different taper as the pieces get smaller towards the top. You can now place a shingle to each mark and determine the taper per course.
- Be sure to pay attention to the size of the tiles, If the tiles get too small it may be necessary to use a larger tile and re-chalk lines at some point.
- Make sure measurements are periodically taken from eve and peak to ensure straight courses.
Watch out for the following:
Roof tiles may be slippery when wet or covered with frost. Fall protection equipment is required when working on a roof deck. The contractor may consider the use of toe boards. InSpire Roofing roof tiles should be stored in temperatures above 45°F and the ambient temperature of the product must be at a minimum of 45°F during installation in order to avoid webbing and/or cracking of the roof tiles. Do not leave debris under the roof tiles while installing that will prevent the design of the roof tile from overlapping on the course below, thus allowing the potential for moisture build up from wind driven rain and/or ice dams. Use accessory products with a life cycle as equally long-term as the roof tiles. Technical Bulletins should be reviewed and considered prior to the start of any project.
Proper Installation of Metal Slate Replica
Under all circumstances, existing roofing materials must be removed down to the substrate, prior to installation.
- The surface area must be uniformly flat, smooth, sound, clean and free of irregularities.
- Examine roof sheathing to verify that sheathing joints are supported by framing and blocking and/or metal clips.
- Verify that substrate is sloped for drainage and completely anchored to sound framing. Any foreign particles shall be cleaned from interlocking areas to ensure proper seating and to prevent moisture intrusion and ice damming. Proper provisions must be made for flashings and roof penetrations.
- Even though metal flashing and other specialty flashings may not be the responsibility of the roofing contractor, these items must be in place prior to slate installation. Work by other trades which penetrate the roof plane must be completed.
How Roofing Materials Should Be Stored
For proper installation, the slates need to be stored on the original pallet, on a flat surface. Proper storage of the product at the jobsite is important. Inspire slate should not be stored on roof decks in such a manner as to over-stress and/or damage the deck and supporting structure. The slates are cambered to ensure that maximum pressure is transferred to the leading edge of the slate during installation. Do not double stack pallets.
Ethical Working Conditions for Roofers
Perform work when existing and forecasted weather permits. Work should be performed in a safe, professional manner and ambient weather conditions are within the limits listed below. Be sure to follow the manufacturer’s installation requirements for all underlayment and any other applications. Comply with any and all local building code requirements. Note of Caution: The slates can be slippery under certain conditions and jobsite safety procedures should be enforced.
Can Shingles Be Installed in the Winter?
Slates should be stored in original packaging in a storage facility where the temperature meets or exceeds 45°F. Use protective coverage over all pallets while being temporarily stored onsite. Roof slates must be conditioned at a temperature no lower than 45°F for twenty-four (24) hours prior to use. Slates may be installed at temperatures as low as 32°F hand fastened, or with a pneumatic gun.