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Concrete Roof Deck: Installation, Types, and Benefits

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A concrete roof deck is a structure that creates a horizontal or inclined surface from poured cement. Concrete roof decks are popular for both commercial and residential structures due to its strength, durability, and ability to tolerate harsh weather conditions. Whether you’re building a new deck or replacing an existing one, understanding the concrete roof deck’s intricacies can help you create a long-lasting, water-friendly solution for your home or company.

What is a Concrete Roof Deck?

A concrete roof deck is an extra layer formed by pouring concrete over a formwork. It acts as a base for the entire roofing system and helps to reinforce the structure. The majority of such roofing uses steel bars or mesh to provide additional support. A concrete roof decking may now support conventional roofing materials, tiles, membranes, and even green roofing systems.

Concrete Roof Deck

Why Concrete roof decks is Important?

Concrete roof decks are necessary for those structures that need extra anchoring and have other architectural thrusts. They have a well-grounded reliability that revolves around the following reasons:

1. Strength And Load Bearing Ability:

The fact that the weight of the concrete slab is not a restrain makes it possible even on regions incapable of performing industries needing snow, strong winds or even foot traffic such as terrace and rooftop gardens.

2. Durability:

Over the years of effective installation and maintenance of a concrete roof decks, the simpler and more economical material can be used that will last for more than a few decades since other materials do not have the lifespan.

3. Fire Protection:

Since concrete is non-combustible, it is a material which adds a safety element to the buildings.

4. Weather Defense:

Hurricane, torrential downpour and even high sweeps are situations that modern building designs are subjected to hence the reason for these types of building roof deck.

5. Conserving Energy:

The thermal mass of concrete tends to have an impact on energy conservation since it aids in cooling and conditioning of the building.

Concrete Roof Decking Details:

Roof decks made of concrete are designed to endure certain atmospheric conditions and structural stresses. The concrete mix used for these decks may be changed from a very hefty industrial construction deck to a lightweight residential building deck. The deck is frequently reinforced with steel rebar or wire mesh to increase its strength and load bearing capacity.
You must remember that waterproofing concrete roof decks is critical since water can permeate the crevices and cause problems over time. Roof decks with proper drainage and sealant may last for decades.

Where to Use a Concrete Roof Deck?

Concrete roof decks are very adaptable and can be utilized in a number of places:

1. Commercial Buildings:

A concrete roof decks is most common in office structures, shopping malls and industrial buildings where there are concerns for stability and other factors.

2. Residential Buildings:

Concrete capping systems are mainly used for flat and pitched roofing in the residential building and can bear secondary loads like photovoltaic cells or living roofs.

3. Parking Structures:

Concrete makes the best material for parking decks, which are manufactured to withstand high loads, oil and chemical spills, and heavy foot traffic.

4. Terraces and Rooftop Gardens:

Concrete roof decks are strong enough to withstand the weight of landscaping, seating, and foot traffic, which makes them suitable for use in roof terraces and vegetation-covered roofs.

Concrete roof decks types

Explore the different types of concrete roof decks, including precast, poured-in-place, and topping options. Learn about each type’s unique features and applications.

1. Precast Concrete Decks

Precast concrete decks are manufactured in factories in a climate-controlled environment and then supplied to the building site. These decks may be installed practically immediately, resulting in a shorter construction duration. These are most likely to be found in commercial buildings and parking structures due to their homogeneity and durability. Precast concrete decks are used when high quality work is required together with rapidity of construction.

2. Poured-in-place concrete decks

A poured in situ concrete deck is one that is constructed by pouring the concrete on-site. Compared to precast alternatives, this approach allows for greater design and form flexibility. It is commonly used to encompass architectural elements manufactured on-site or those composed of steel/fiber composites with special structural characteristics. The on-site concrete pouring procedure allows the concrete to be sculpted to fit the structure’s unique designs and weight bearing characteristics.

3. Topped Concrete Decks

A capped concrete deck is one in which a thick layer of concrete is poured over an existing structure to reinforce it or, in the absence of one, to increase its protection. This kind is very useful in renovating old roofs or building new, more durable ones. Special topping materials may have ornamental elements or even graphics around the borders in attractive colors. Topped decks are commonly employed in restoration projects that need roof repairs or modernization.

4. Post-tensioned concrete decks

A post-tensioned deck is a structure made out of steel “cables” or rods that are tensioned or pulled after the concrete has set. Comparatively, this reinforcing approach allows for larger spans while using less concrete. In this scenario, post-tensioning improves the deck’s structural efficiency and load capacity, making it suitable for larger commercial buildings and other structures subjected to significant loads.

5. Tilt-Up Concrete Deck

Tilt up concrete decks are built by vertically elevating reinforced concrete panels that are cast and laid out on the ground first. This strategy works well on a variety of major projects and tends to shorten them further. The tilt-up technology is particularly beneficial in the construction of structures that require large scale flat surfaces for commercial and industrial uses. It enables for quick fabrication and precise panel placement.

Concrete Roof Decks Colors

Discover the wide range of colors available for concrete roof decks, including neutral and custom options.

Concrete roof decks can be finished in a variety of colors to suit your design preferences:

  • Gray: This is the most common color for concrete decks, offering a clean, industrial look.
  • Beige: A softer, warmer tone, often used for residential projects to blend with natural surroundings.
  • Red/Brown: Often used for decorative purposes or to mimic the appearance of traditional clay tiles.
  • Custom Colors: Concrete can be stained or tinted to match specific design requirements, offering flexibility in creating a unique aesthetic.

Concrete Roof Decks Cost

Understand the cost of installing a concrete roof decks, including material, labor, and additional factors that influence pricing.

The cost of creating a concrete roof decks varies depending on factors such as size, type of concrete, completion time, material use, and finishing. In general, this indicates that the overall cost of any particular project will be between $7 and $20 per square foot, with some exceeding that according to the nature of the undertaking.

Breakdown of Costs:

Materials: $3 to $6 per square foot.

Labor: $4 to $8 per square foot, with the complex design commanding a higher cost.

Waterproofing and Finishing: Supplementary charges of between $2 and $4 per square foot for application of sealant and other finishes in addition to surface waterproofing sheets.

Concrete Roof Decks Cost Per Square Foot

The cost per square foot for a concrete roof deck varies based on the amount covered, but it is typically between $10 and $20 when all factors such as materials, labor, and waterproofing are included. Custom designs and additional reinforcement may result in a higher final pricing.

Advantages of a Concrete Roof Deck

Learn the key advantages of a concrete roof deck, from durability to fire resistance and energy efficiency.

1. Durability:

The roof decks are made of concrete and are intended to survive for many decades with minimal deterioration.

2. Low Maintenance:

Concrete roof decks require less maintenance than buried wood or metal sheet roofs.

3. Roof Support Ranches:

Ideal for the construction of rooftop gardens, solar systems, and other heavy structures.

4. Energy Efficiency:

The thermal mass associated with concrete decreases temperatures, lowering energy expenses.

5. Roof Supports Ranches:

Suitable for installation of rooftop gardens, solar system and any other weighty structures.

How to Install a Concrete Roof Deck?

If you’re not sure of your DIY skills, it’s better to call a professional .They have the experience and techniques to do it right.

A detailed guide to installing a concrete roof deck, including preparation, reinforcement, and waterproofing.

1. Surface Preparation:

The surface must be clean, even and prepared for the pouring of the concrete. Create necessary devices or vessels and shape the concrete.

2. Reinforcement:

Both steel bar (rebar) and wire mesh must be placed on the dock in order to add strength to the deck.

3. Concrete Pouring:

Work on pouring of the concrete to ensure that every part of the surface which contains steel reinforcement is well covered by the concrete.

4. Leveling:

Levelling and smoothing surfaces with the aid of tools which are deemed to be specifically designed for that purpose

5. Curing:

Usage of water should be made so that the concrete cures in an effective manner depending on the weather, which can take even six days.

6. Waterproofing:

A waterproofing membrane should be applied to the deck to keep moisture away from it and extend its life span.

Expert Tip:

For a well-performing and durable roof deck, it is important to carry out proper curing. This means that the surface should not be subjected to heavy traffic during this duration with the aim of avoiding cracks or any form of damage.

Concrete Roof Deck

How to Repair a Concrete Roof Decking?

Learn how to repair a concrete roof deck with this step-by-step guide, including common issues and repair materials.

1. Inspect for Damage:

Look for cracks, leaks, or other unusual symptoms of damage.

2. Clean the Area:

Remove any debris, soil, or other objects from the damaged surface.

3. Repair Material:

Apply repair mortar to the affected area.

4. Resurface if Necessary:

If the damage has caused all surficial areas to be covered over and other wall portions to be significantly damaged, the entire area may need to be resurfaced.

5. Seal the Deck:

Apply a waterproof sealer to the repaired area to prevent additional damage.

Expert Tip:

Look for tiny fractures on your concrete roof decks and repair them to avoid further damage and money later on.

Concrete Roof Deck

What types of warranties are available for Concrete roof decks?

In terms of warranties for concrete roof decks, there are those that include materials, workmanship or both.

1. Material Warranty:

Protects the property owner against defects in the concrete material generally range from 10 years to 25 years.

2. Workmanship Warranty:

Protects the owner against nonconformities related to the work quality usually in the years of encumbrance from 5 years up to 10 years.

3. System Warranty:

This warranty is two-fold covering both the materials and the installation of the concrete which may last for more than 25 years.

Conclusion

Concrete terrace roof systems provide a wide range of remarkable, high-performance features, including superior strength, load capacity, and fire resistance. A concrete roof decking, whether commercial or residential, serves as a solid foundation for your roofing system while also improving the building’s stability and effectiveness.

Expert Tip:

When installing a concrete roof decks to ensure that the building can survive potential water intrusion, it is important to include effective waterproofing from the start to avoid water damage and keep the structure in good condition for longer.

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FAQs

How long does a concrete roof deck last?

A concrete roof deck may typically endure between 30 and 50 years. This is influenced by factors such as material quality, construction methods, and maintenance. While concrete is strong and durable, factors like moisture, temperature fluctuations, and loads can shorten its lifespan. Regular inspections and repairs can extend the deck’s life.

What to do if my concrete roof deck is leaking?

If your concrete roof deck is leaking, follow these steps:

  1. Locate the problem: Examine the crack, split, or any damaged area of the concrete deck to trace the leak. Look for signs of water stains or dampness.
  2. Clear the area: Clean the area surrounding the leak, ensuring it’s completely dry before proceeding with the repair.
  3. Fix the leak: Use a concrete-compatible sealant or patching compound. For larger cracks or structural damage, you may need a patching mortar or professional assistance.
  4. Waterproofing: After repairs, apply a waterproof sealant over the entire deck to prevent future leaks.
  5. Contact experts: If the leakage persists, consult a professional roofing contractor or concrete repair specialist.

How much does it cost to replace a concrete roof deck?

The cost to replace a concrete roof deck can range between $75 and $150 per square foot, depending on deck size, design complexity, and location. This estimate includes materials and installation. Additional factors like site accessibility, removal of old materials, and restructuring may increase the cost.

What materials are used in a concrete roof deck?

  • Concrete mix: Made from cement, sand, gravel, and water, the proportions and quality of these ingredients impact the strength and durability of the deck.
  • Reinforcement steel (Rebar): Steel bars or meshes are embedded in the concrete to enhance its load-bearing capacity and prevent cracking.
  • Formwork: Temporary molds that shape the concrete during the curing process and ensure the desired shape and surface quality.
  • Waterproofing membranes: These membranes, often asphalt-based, rubberized, or polymer-modified, prevent moisture from penetrating the concrete deck.
  • Protective coatings: Additional layers can be applied to improve durability, enhance aesthetics, and provide protection from deterioration.

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About the author

Alden Dale has been writing exclusively about roofing for Quick Home Experts since 2016. Before joining Quick Home Experts, Alden gives roofing guide and advice tip various homeowners and DIY enthusiasts for over four years. He holds a BA in Environmental Studies from the University of California (UOC) and MA in Environmental Research from Stanford University.

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