Roof Felt Calculator
Calculate how much roofing felt you need for your project. Estimate costs based on roof dimensions, felt type, and overlap requirements.
Step 1: Roof Dimensions
Measuring Your Roof
For accurate calculations, measure the total length and width of your roof area. Include all sections that need covering. Complex roofs with many valleys, hips, or dormers will require more felt.
Step 2: Felt Details
About Roofing Felt
Roofing felt provides a secondary waterproof layer beneath your main roofing material. Standard felt offers basic protection, while breathable membranes improve ventilation and reduce condensation.
Roof Felt Requirements
Total Material Cost
Material Comparison
| Felt Type | Lifespan | Cost per Roll | Rolls Needed | Total Cost |
|---|
Cost Analysis
Calculation Formula
Rolls Needed = Roof Area ÷ (Effective Roll Coverage)
The number of rolls required is calculated by dividing your total roof area (including waste allowance) by the effective coverage of each roll, accounting for overlaps and trimming.
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