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` = "Purlins for Dormers"`

Enter a value for all fields

The **Purlins for Dormers **calculator computes the total number and length of purlins (roof support boards) for needed for one or more roof dormers based on the dimensions.

**INSTRUCTIONS**: Choose units and enter the following:

- (
**DD**) Dormer Depth - (
**DW**) Dormer Width - (
**P**) Pitch of Dormer Gable (choose pitch from list)_{2} - (
**P**) Pitch of Main Roof (choose pitch from list)_{1} - (
**n**) Number of Dormers - (
**pS**) Purlin Spacing

**Purlins for Dormers (PRLN):** The calculator returns:

**(TA) Area**: Total surface area of dormer(s) in square feet.**(nP) Number of Rows**: Number of rows of purlins on a single dormer.**(pL) Purlin Length:**For each row (both sides), the length of the purlin.**(TBL) Total Board Length:**The sum of the lengths of the purlin boards

Items with units can be automatically converted to compatible units via the pull-down menu.

- Gabled Roof
- Hip Roof
- Shed Roof
- Dormers

- Total Building Materials Calculator
- Pitch of a Roof - Computes angle of incline in the roof in both degrees and rise over 12" run (e.g. 26.6
^{o}: 6/12) based on the length of the rise and run. - Number of Trusses Needed for a Roof - number of trusses needed based on the roof width and the truss spacing.
- 4x8s needed for a roof - Calculates the number of 4x8 sheets needed to cover a roof.
- Roofing nails needed for a roof - Calculates the number of roofing nails needed for a roof in normal and high wind conditions.
- Number and Length of Metal Roof Panels - Computes the length and number of metal panels and trim pieces for a metal roof.
- Screws for a Metal Roof - Computes the number of screws needed for a metal roof.
- Number and Length of Purlins for a Roof - Computes the number of purlins for a roof based on dimensions and spacing.
- Number and Length of Rafters - Computes the number and length of rafter boards based on roof dimensions and spacing.
- Number and Length of Rafter and Collar ties - Computes the number and length of rafter ties and collar ties based on roof dimensions and spacing.
- Number and Length of wall top and bottom wall plates
- Number of Studs for a Room
- Number of Studs in a Wall
- Room Interior Area (wall and ceiling)
- Cubic Feet in a Room (volume)
- Number of 4x8 or 4x12 Sheets for a Room
- Number and Length of Floor Joists
- Number of Joist Hangers
- Compute the Cost of Floor Joists
- Compute iJoists for larger floors
- Compute the Number of 4x8 Sheets to cover the Deck or Floor
- Compute the number of Decking Boards to cover the deck or floor

Roofing Geometry Calculators