How to Put a Pitch on an Existing Flat Roof

Adding a pitch to an existing flat roof involves altering the roof's structure to create a slope for proper drainage. Here's a general guide to help you install a pitch on an existing flat roof:

1. Safety Precautions:

- Ensure your safety by wearing appropriate protective gear, including a harness and fall arrest system.

- Disconnect all utilities, including electricity and gas, before beginning work.

2. Remove Existing Roofing Materials:

- Remove the existing roofing material carefully, being mindful not to damage the roof deck.

- Dispose of the old roofing material properly.

3. Inspect Roof Deck:

- Inspect the roof deck for any damage or rot. Repair or replace damaged areas as needed.

4. Install Slope:

- Determine the desired slope for your roof. A slope of 1/4 inch to 1 foot is typically recommended.

- Install slope using a combination of materials, such as tapered insulation or wood furring strips.

5. Secure Tapered Insulation:

- If using tapered insulation, secure it to the roof deck using appropriate fasteners or adhesives.

6. Install Furring Strips:

- If using wood furring strips, space them evenly and secure them to the roof deck perpendicular to the desired direction of the slope.

7. Attach New Roofing Material:

- Install the new roofing material, such as asphalt shingles or metal roofing panels, according to the manufacturer's instructions.

- Ensure the roofing material is properly secured and overlaps to prevent water infiltration.

8. Install Flashings:

- Install metal flashings around the edges of the roof, such as the eaves, rake boards, and valleys, to prevent water from seeping in.

9. Seal Joints and Seams:

- Apply sealant to all joints and seams to ensure the roof is watertight.

10. Inspection and Maintenance:

- Inspect the roof regularly for any damage or leaks and address any issues promptly.

11. Building Codes:

- Check with your local building department to ensure your project aligns with building codes and permits.

It's important to note that adding a pitch to an existing flat roof can be a complex and physically demanding task. If you're not comfortable working on roofs or lack experience in roofing, it's best to hire a professional roofing contractor to ensure the job is done safely and correctly.