180+ Building A Flat Roof With Lantern

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Introduction: Building a Flat Roof with a Lantern Skylight A flat roof can be a great addition to a modern home, offering space for a rooftop garden or deck. Adding a lantern skylight brings in natural light and creates an architectural feature. This guide provides a step-by-step approach to building a flat roof with a lantern skylight. It's important to note that building codes vary by location, so consult with local authorities and consider consulting with a structural engineer to ensure safety and compliance. This project requires advanced DIY skills and experience with construction.

Step 1: Planning and Design Begin by thoroughly planning your project.

Determine the size and location of the flat roof.

Decide on the dimensions and style of the lantern skylight.

Create detailed blueprints, including the roof's slope (minimum 1/4 inch per foot for drainage), structural support, and the skylight's integration.

Obtain the necessary building permits.

Factor in insulation needs to meet energy efficiency standards.

Step 2: Gathering Materials and Tools Gather all necessary materials and tools before starting construction.

Lumber (pressure-treated for framing, plywood or OSB for sheathing).

Roofing materials (EPDM, TPO, or modified bitumen).

Lantern skylight (pre-fabricated or custom-built).

Insulation (rigid foam or spray foam).

Fasteners (nails, screws, construction adhesive).

Flashing (aluminum or copper).

Safety equipment (gloves, safety glasses, hard hat).

Tools: Saw (circular saw, reciprocating saw), drill, hammer, measuring tape, level, roofing tools (roller, heat gun if using modified bitumen).

Step 3: Building the Roof Frame Construct the roof frame according to your plans.

Establish the outer walls and supports for the roof.

Build the roof joists, ensuring proper spacing and slope for drainage. A typical spacing is 16 inches on center.

Install blocking between the joists for added support, especially around the skylight opening.

Frame the opening for the lantern skylight, ensuring it's square and level. Use doubled-up joists around the opening for added strength.

Step 4: Installing the Roof Sheathing Cover the roof frame with sheathing.

Cut the plywood or OSB sheathing to size.

Attach the sheathing to the joists using nails or screws, ensuring proper spacing.

Stagger the seams of the sheathing for added strength.

Ensure the sheathing is securely fastened and flush with the framing.

Step 5: Installing Insulation Install insulation to meet energy efficiency standards and prevent condensation.

Cut the rigid foam insulation to fit between the joists or apply spray foam insulation.

Seal all seams and edges of the insulation to prevent air leaks and moisture intrusion.

Ensure the insulation is properly installed to maximize its effectiveness.

Step 6: Installing the Roofing Membrane Install the roofing membrane to create a waterproof barrier.

Clean the sheathing surface thoroughly.

Apply adhesive if required by the membrane manufacturer.

Roll out the roofing membrane, ensuring it's smooth and wrinkle-free.

Overlap seams according to the manufacturer's instructions.

Seal the seams using a heat gun (for modified bitumen) or adhesive (for EPDM or TPO).

Properly flash around any penetrations, such as vents or pipes.

Step 7: Installing the Lantern Skylight Install the lantern skylight.

Prepare the skylight opening by ensuring it's level and square.

Apply flashing around the perimeter of the opening to prevent water leaks.

Carefully lift the lantern skylight into place.

Secure the skylight to the framing using screws or other appropriate fasteners.

Seal the perimeter of the skylight with sealant to prevent water intrusion.

Step 8: Flashing and Sealing Ensure proper flashing and sealing to prevent leaks.

Install flashing around the base of the lantern skylight, overlapping the roofing membrane.

Use a high-quality sealant to seal all seams and edges.

Inspect the flashing and sealant regularly for any signs of damage or deterioration.

Step 9: Finishing Touches Complete the project with any necessary finishing touches.

Install trim around the edges of the roof.

Add gravel or other ballast to protect the roofing membrane (if applicable).

Clean the area and remove any debris.

Conclusion Building a flat roof with a lantern skylight is a challenging but rewarding project. By following these steps and consulting with professionals when needed, you can create a beautiful and functional addition to your home. Remember to prioritize safety and adhere to all building codes. Regular maintenance is crucial to ensure the longevity of your roof and skylight.

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