Estimating exposed fastener metal roofing
Corrugated, R-panel, PBR, ag panel: wide panels, screwed through the face, usually cut to length at the supplier. The estimate is the panel list plus the trim, the screws and the labor.
The takeoff: panels on each facet by coverage width, each at its length plus the overhang, grouped into a runout list; trim by the true foot for each line; screws and closures by the count; underlayment by the square; labor per square for the product.
Panels
Add your profile to the catalog with its net coverage width, 36 inches for most corrugated and R-panel, and the drafter lays a strip across each facet every 36 inches. A panel that ends at a hip or valley is read at the longest run of its strip so the piece covers the cut. A panel past a dormer stays whole and is notched unless the dormer takes its full width.
- Runout list. Every panel length in the job with its count, longest first, the list the supplier cuts from.
- Cut list by facet. The same panels in facet order for the crew, and the CSV with the columns Section, Qty, Feet, Inches with decimal.
- Panel tolerance, add to all panels, spares. Lengths within your tolerance are one length; the overhang goes on every panel in one step; spares are added by count at a length.
The panel path is the same one standing seam uses; the metal panel cut list page has a sample CSV.
Trim, screws, closures
Every line is marked as what it is and the pricer carries its lineal feet at true length: eave trim, rake trim, ridge cap, hip cap, valley, sidewall, headwall, transition. Screws are counted by the bag from their uses, so many per panel and one every so many feet of trim, rounded to whole bags; closures and sealant go with the ridge and eave trim; pipe boots by size and vents are placed on the drawing and counted.
Underlayment and labor
- Underlayment. The metal roofing type picks its field underlayment and valley ice and water, each with coverage, lap waste and install per square; ice and water on the hips is a tick box.
- Labor. Install per square is the product's own number, so an exposed fastener panel can carry a lower install rate than a mechanical seam profile. Tear-off, trips, dump, permit, delivery, warranty, tax and markups are job settings.
What comes out
Summary, materials and labor sheet, price to the customer, install ticket with the cut list by facet, and the panel CSV. For a quick count on one facet use the metal panel calculator; for the seamed profiles see standing seam.
Questions
How do you estimate an exposed fastener metal roof?
The same way as any panel roof: count panels on each facet by the coverage width, read each panel's length at the eave, ridge, hip or valley, add the overhang, group by length. Then trim by the foot for each line, underlayment by the square, screws by the square, closures and boots by the count, and labor per square.
What coverage width do exposed fastener panels have?
Common corrugated and R-panel profiles cover 36 inches net after the side lap; some cover 24 or 32. Add your profile to the catalog with its coverage width and the layout uses it.
How are screws counted?
A part in the catalog, such as a bag of 250 panel screws, carries its uses: so many per panel piece for the fastening, one every so many feet of eave and rake for the trim. The job count is rounded up to whole bags.
Does a panel that runs past the ridge get cut?
On a gable the panel ends at the ridge and the ridge cap covers the gap. On a hip or valley the panel is cut at the angle and its length is the longest run of the strip. On a shed roof the panel runs eave to high wall and gets the headwall flashing length.
Can I estimate an exposed fastener roof over purlins on a pole barn?
Yes. Trace the building footprint, mark the eaves and rakes, type the pitch and lay the panels. Purlins and framing are not in the takeoff; the roofing, trim, screws and labor are.