Roof Top Deck Construction

First, you must make sure the roof is strong enough to support 55 lbs per square foot. Next, you will need to install a watertight EPMD rubber membrane over the top of the roof deck for protection against water infiltration in place of roofing materials. Then, you will install “sleepers” or flat 2x6s laid flat every 16” on top of the roof surface. This will provide the surface for you to attach the decking.
There are proprietary pedestal systems that provide a very stable, level and serviceable deck over a roof membrane, though, they are relatively expensive compared to conventional methods.
In whatever manner a deck is constructed over a roof, maintenance for cleaning and repairs of the membrane below is recommended. Deck “panels” should be constructed that can be lifted with minimal effort or damage. The roof below should be cleaned and inspected at whatever intervals is found necessary for each deck. A deck located under pine trees will need much more maintenance to clean out debris than a rooftop deck above a high-rise.
Flat roofs are prone to leaking even without decks because of design errors, improper materials and improper installation. Many times when roof decks are installed, they further damage roofs causing more severe leaking and drainage problems. Proper waterproofing for a roof deck involves installing an EPDM membrane and flashing around deck supports and rail penetrations. This is often accomplished using EPDM boots that fit over the openings. EPDM is a rubber like sheet used for waterproofing surfaces. Roofs should be sloped about 1/4" every 12" to shed water. Drainage is very important because pooling water can cause leaks.
How to Decorate Deck Support Columns
Browse some examples of decorative deck support posts for tall decks.
How to Size a Deck Beam
Learn about how to choose the correct size beam for your deck. We discuss engineered beams and "sandwiched" style beams.
How to Install Deck Post Wraps and Sleeves
Learn how to install trim or post sleeves over your pressure-treated support posts for a cleaner finish and to protect the material from checking.
Decking Patterns
Installing your decking at a 45-degree angle is a popular style for decks. This can be done to reduce decking seams or just for appearance.
Best Hidden Fasteners for Decking
Hidden fasteners create a clean deck surface and can be used with composite, wood and other materials. Learn about hidden deck fasteners at Decks.com.
Installing Composite Decking
Learn about how to install composite decking. Topics include expansion and contraction issues and hidden fastener systems.
Explore Articles by Topic

Footings
Information related to installing frost footings for decks

Framing
Learn structural framing methods

Decking
Learn about wood and composite decking materials

Stairs
An in-depth look at the complex issue of how to build stairs

Railings
How to install guardrails and handrails to meet IRC code

Features
An overview on water drainage, benches, planters and lights

Design
The basics of deck design

Planning
Learn about permits and working with contractors

Porches & Patios
Build a covered deck to enjoy all seasons

Ledger
Proper attachment techniques

Care
Maintain your deck to maintain your investment

Materials
An overview on water drainage, benches, planters and lights
Roof Top Deck Construction

First, you must make sure the roof is strong enough to support 55 lbs per square foot. Next, you will need to install a watertight EPMD rubber membrane over the top of the roof deck for protection against water infiltration in place of roofing materials. Then, you will install “sleepers” or flat 2x6s laid flat every 16” on top of the roof surface. This will provide the surface for you to attach the decking.
There are proprietary pedestal systems that provide a very stable, level and serviceable deck over a roof membrane, though, they are relatively expensive compared to conventional methods.
In whatever manner a deck is constructed over a roof, maintenance for cleaning and repairs of the membrane below is recommended. Deck “panels” should be constructed that can be lifted with minimal effort or damage. The roof below should be cleaned and inspected at whatever intervals is found necessary for each deck. A deck located under pine trees will need much more maintenance to clean out debris than a rooftop deck above a high-rise.
Flat roofs are prone to leaking even without decks because of design errors, improper materials and improper installation. Many times when roof decks are installed, they further damage roofs causing more severe leaking and drainage problems. Proper waterproofing for a roof deck involves installing an EPDM membrane and flashing around deck supports and rail penetrations. This is often accomplished using EPDM boots that fit over the openings. EPDM is a rubber like sheet used for waterproofing surfaces. Roofs should be sloped about 1/4" every 12" to shed water. Drainage is very important because pooling water can cause leaks.
How to Decorate Deck Support Columns
Browse some examples of decorative deck support posts for tall decks.
Building Your Deck For A Hot Tub
Learn how to build a deck to properly support a hot tub or spa. Hot tubs are very heavy. Never place a hot tub on a deck that wasn't designed for the additional load.
How to Build a Multi-Level Deck
Multi-level decks are very popular. Learn how to build a deck that steps up or down using shared posts and footing connections.
Decking Patterns
Installing your decking at a 45-degree angle is a popular style for decks. This can be done to reduce decking seams or just for appearance.
Installing Composite Decking
Learn about how to install composite decking. Topics include expansion and contraction issues and hidden fastener systems.
Introduction to Decking
Spacing between deck boards provides several critical functions, such as drainage & drying. Learn how to space and stagger deck boards at Decks.com.
Explore Articles by Topic

Footings
Information related to installing frost footings for decks

Framing
Learn structural framing methods

Decking
Learn about wood and composite decking materials

Stairs
An in-depth look at the complex issue of how to build stairs

Railings
How to install guardrails and handrails to meet IRC code

Features
An overview on water drainage, benches, planters and lights

Design
The basics of deck design

Planning
Learn about permits and working with contractors

Porches & Patios
Build a covered deck to enjoy all seasons

Ledger
Proper attachment techniques

Care
Maintain your deck to maintain your investment

Materials
An overview on water drainage, benches, planters and lights