Calculating Shingles Needed for a 1200 Square Foot House: A Comprehensive Guide

To determine the exact number of shingles required for a 1200 square foot house, you need to take into account various factors, including the coverage of your shingles and additional considerations such as waste and roof design.

Basic Calculation

Typically, a standard bundle of shingles covers approximately 33.3 square feet. Here's how to calculate the number of bundles you need:

Total area to cover: 1200 square feet Coverage per bundle: 33.3 square feet Calculation: Number of bundles Total area / Coverage per bundle 1200 / 33.3 ≈ 36

Since you can't purchase a fraction of a bundle, you would round up to the nearest whole number. Therefore, it is recommended to purchase 37 bundles of shingles to cover a 1200 square foot house.

Additional Considerations

Waste Factor

It's always a good idea to add extra shingles for waste and mistakes. A common recommendation is to add 10-15% waste. In this scenario, if you have 37 bundles, adding 10% would bring the total to approximately 41 bundles.

Roof Design

If your roof has multiple slopes or is more complex, you may need additional bundles to ensure a proper fit. It's advisable to consult with a roofing professional for a more precise estimate. Before making any purchases, check the local store to find the range of shingles available, as the coverage can vary significantly based on the style and brand.

Factors Affecting Shingle Coverage

The number of bundles needed can vary based on the shingle style and brand. Local stores may list the covers per bundle, ranging from a high of about 33.3 square feet to a low of 16.6 square feet. To determine the number of bundles required, take the total area and divide it by the square footage per bundle, then round up to the nearest whole number.

Total area to cover: 1200 square feet Shingle coverage: Assume an average coverage of 33.3 square feet per bundle Calculation: Number of bundles 1200 / 33.3 ≈ 36

Even a slight difference in coverage can result in a wide range of bundles needed, from 31 to 62. Therefore, it is essential to know the specific shingles you plan to use before making a purchase.

Ensure that you have enough shingles to cover the edges, overlaps, and complex areas of your roof. For example, a pitched roof will require more shingles, potentially up to 1800 square feet. Factors like valleys, overhangs, and porches also need to be considered. Don't forget to account for the garage space if it is part of the covered area.

Conclusion

To accurately calculate the number of shingles needed for a 1200 square foot house, take the following steps:

Determine the base coverage of your shingles. Account for waste by adding an extra 10-15%. Consider any unique features of your roof that may increase shingle needs. Consult a professional if your roof design is complex.

By carefully considering these factors, you can ensure you have the right amount of shingles to complete your roofing project successfully.