Can you build a wooden porch over a concrete porch?

Many homeowners with existing concrete porches consider building a new wooden porch over the top to update the look of their home’s exterior. This can be an effective way to add charm and character without undergoing a full porch demolition. However, there are important factors to consider before constructing a wooden porch over an existing concrete one. Proper planning and execution are necessary to ensure structural integrity and avoid potential issues down the road.

Is it Possible to Build a Wood Porch over Concrete?

Yes, it is possible to build a wooden deck or porch over an existing concrete porch. With proper planning, materials, and construction techniques, a wood porch overlay can be successfully achieved. The key requirements are:

• The existing concrete porch must be in good, stable condition, without major cracks or crumbling areas.
• The concrete porch foundation should be reinforced as needed to handle the added weight load.
• Pressure treated lumber, outdoor rated fasteners, and weather-resistant materials should be used for optimal durability.
• Allow for proper drainage and ventilation to prevent moisture buildup and rotting of wood members.
• Design and install the decking with an adequate number of support posts and footings.
• Pay close attention to local building codes for required specifications and permits.

If done properly, a new wood overlay can successfully integrate with and enhance an existing concrete porch. The key is taking the time to address structural considerations and use suitable materials to build a safe, long-lasting wooden deck addition.

Reasons Homeowners Choose to Add a Wood Porch over Concrete

There are several popular reasons homeowners choose to construct a new wood porch or deck over an existing concrete foundation:

• To update the aesthetic and add visual appeal – wood porches are seen as warmer and more inviting than concrete.
• To make the entryway more functional – adding a wraparound wood porch can expand usable space.
• To increase home value by improving curb appeal.
• To boost energy efficiency with a covered outdoor space that provides shade.
• For better outdoor entertaining area and expanded living space.
• To correct drainage issues on an existing concrete slab porch.
• To fix a deteriorating concrete porch in a more cost-effective manner.
• To add architectural details and interest to a plain concrete stoop.

The versatility, beauty, and functionality of wood porches make adding one over concrete an attractive option for many homeowners seeking an exterior upgrade.

Considerations for Building Over Concrete

When planning a wood porch build over a concrete foundation, there are several important factors to take into account:

Structural Analysis

The existing concrete porch must be structurally sound to support the weight of the new wood structure on top. Cracks, crumbling areas, moisture damage or other deterioration will need to be repaired prior to building. Reinforcing the foundation and adding supportive footings may be required.

Moisture Management

Proper drainage and ventilation need to be incorporated to prevent trapping moisture between the concrete slab and wood decking. Allow for drainage gaps and use vapor barrier materials as needed.

Frost Heave Precautions

In colder climates, frost heave where the ground shifts due to freezing temperatures can wreak havoc on porch foundations. Frost footings may need to be installed.

Weatherproofing

Pressure treated lumber, water-resistant building materials, and sealants should be used throughout the project for maximum durability and weatherproofing.

Railings for Safety

Ensure railings around the perimeter meet local code requirements for minimum height (often 36-42 inches). This provides important fall protection.

Local Building Codes

Building permits are usually required and specific porch construction specifications must be met. Research codes thoroughly.

Contractor Experience

Hiring a qualified deck builder with expertise in structural work and building over concrete is recommended.

How to Build a Wood Porch over Concrete

Here is an overview of the main steps involved in constructing a wood porch over an existing concrete slab:

Planning

– Evaluate the existing concrete porch condition and make any necessary repairs.

– Choose a porch design suited to your home’s architecture and layout needs.

– Confirm local building codes and acquire required permits.

Preparation

– Layout for support post positions based on planned decking framework.

– Remove old surface coverings down to bare concrete.

– Make drainage accommodation such as channels or gaps between concrete and framing.

Framing

– Install supportive footing blocks for posts, embedded into the ground.

– Erect sturdy vertical support posts anchored to footings.

– Construct the floor framework using pressure treated lumber.

– Add supplemental horizontal beams for reinforcement.

Decking

– Select weather resistant deck boards suited for outdoor use.

– Allow for proper gaps between deck boards for drainage.

– Use corrosion resistant screws or nails for fastening decking.

Railings

– Frame code-compliant railing sections around the perimeter.

– Install newel posts and balusters for safety and ornamentation.

Steps

– Frame stair stringers and risers from structural lumber.

– Overlay treads using deck boards to match main porch.

Finishing Touches

– Add decorative elements like skirt boards, lighting fixtures, benches.

– Use weatherproof sealant on all exposed wood surfaces.

– Obtain final inspection approval before regular use.

Following proper building methods and using suitable materials will help ensure a long-lasting, safe wood porch built over concrete.

Best Materials for Structural Integrity

Choosing the right types of building materials is key to creating a sturdy wooden porch overlay for a concrete foundation. Here are some of the best options:

Pressure Treated Lumber

All structural framing members in contact with concrete should utilize pressure treated lumber. Treating the wood provides resistance to moisture, rotting, and wood-destroying insects. Common types used include:

• YellaWood – Alkaline copper quaternary (ACQ) treated for ground contact.
• Preserve ACQ – Copper azole preservative treatment.
• NatureWood – Ammoniacal copper zinc arsenate (ACZA) preserved.

Outdoor Wood Decking

For the visible deck flooring, choose weather-resistant wood species or composites such as:

• Ipe – Tropical hardwood with exceptional durability.
• Redwood – Resistant softwood good for stained finishes.
• Trex – Composite material made from recycled plastic and wood.
• TimberTech – Plastic and wood composite decking.

Stainless Steel Hardware

Use corrosion-resistant stainless steel nails, screws, bolts, railing anchors, and hangers for greatest longevity. Hot dip galvanized is also suitable.

Concrete Expansion Anchors

For attaching ledger boards directly to concrete, wedge anchors or sleeve anchors are an appropriate concrete fastener choice.

Flashing Materials

Self-adhering waterproof flashing tape prevents moisture accumulation at joints where wood meets concrete. Install between ledger boards and concrete.

Choosing the right porch construction materials and finishes provides protection against deterioration and helps the wood components last longer over concrete.

Tips for Successful Build

Here are some helpful tips to ensure your project constructing a wood porch over concrete goes smoothly:

• Check for hidden electrical lines or plumbing before digging post footings.
• Prime and paint any exposed concrete edges to prevent moisture infiltration.
• Use galvanized fasteners and hardware for longevity.
• Incorporate shims during framing to achieve level decking.
• Allow gaps between decking boards for drainage.
• Research local frost line depth for proper footing holes.
• Follow all building codes for railing height, joist spans, etc.
• Consider hiring a building inspector for plan review and final approval.
• Examine finished porch for sharp edges or protruding screws.
• Apply weatherproof finish to protect wood from sun and moisture.

Planning thoroughly, using quality materials, and taking care during construction will yield great results. A professional deck builder is recommended for best outcomes.

Cost Considerations

Constructing a new wood porch over an existing concrete foundation typically costs $25-$50 per square foot, with the total varying based on:

• Porch size – Larger decks cost more overall.
• Access – Tricky access for demolition and materials increases costs.
• Framing complexity – Multi-level designs add expense.
• Materials used – Treated lumber is lower cost than exotic hardwoods.
• Ornamentation – Adding columns, railings, lighting raises the budget.
• Site prep work – Drainage improvements, foundation repair adds cost.
• Contractor rates – Prices range based on company and expertise.
• Local labor costs – Higher rates in some regions.

Many homeowners find adding a wood porch over concrete to be a valuable upgrade that boosts curb appeal and functionality for years to come.

Maintenance Tips

Proper maintenance is crucial for ensuring your new wood porch overlay stays beautiful and avoids deterioration issues over time:

• Perform annual inspection checking for loose fasteners, protruding nails, etc.
• Re-coat outdoor wood finish every 1-2 years to renew water protection.
• Keep decking clear of leaves and debris to prevent moisture buildup.
• Allow ventilation space under decking to avoid trapping moisture on concrete.
• Clear clogged drainage gaps between decking boards.
• Wash off dirt and mildew accumulation with mild detergent and water.
• Spot treat any algae or mildew growth.
• Repair cracked or damaged boards and replace with compatible decking.
• Reseal concrete foundation edges every few years as needed.

Proper maintenance helps preserve your investment and keeps a wood porch floor looking its best year after year. Be proactive and attend periodically to needed upkeep.

Advantages of Wood Overlay Porches

Constructing a new wood porch over an existing concrete foundation offers many great benefits:

• Low-Cost Upgrade – Less expensive than full porch demolition.
• Curb Appeal – Wood porches have greater visual interest and warmth.
• Outdoor Living Space – Adds useful outdoor entertaining area.
• Energy Efficient – Provides shaded space and reduces cooling costs.
• Customizable Design – Match the style of your home.
• Increased Home Value – An attractive porch adds resale value.
• Functionality – Wraparound design allows more direct access.
• Easier Maintenance – New pressure-treated framing lasts for decades.
• Enhanced Safety – Opportunity to add better railings and lighting.

Wood porches provide charm and character while offering numerous practical benefits. An overlay build preserves the existing concrete foundation while revitalizing the space.

Disadvantages to Consider

While a wood overlay porch offers many advantages, there are also some potential downsides to keep in mind:

• Higher Upfront Cost – More expensive than just repairing a concrete porch.
• Permits Required – Building codes add time and costs.
• Shorter Lifespan – Wood deteriorates faster than concrete.
• Regular Maintenance – Sealing, cleaning required to protect wood.
• Potential Leaks – Improper installation can lead to moisture issues.
• Dry Rot Risk – Inadequate ventilation causes fungal decay.
• Complex Construction – Professional expertise recommended.
• Weather Damage – Wood is more vulnerable than concrete.

Proper planning, design, material selection and hiring experienced builders helps minimize these disadvantages for a successful project.

Alternatives to Consider

While building a new wood porch over concrete is a popular option, some other alternatives include:

Refresh Existing Concrete Porch

Resurface stained or worn concrete with new overlay products, stains/sealers, or tile. Repair cracks and modernize railings.

Patio Pavers Overlay

Install interlocking concrete pavers over old concrete for an updated look without replacing slab.

Extend Porch with Addition

Rather than go over concrete, build fresh wood decking off the side for more square footage.

Smaller Wood Landing

Save cost by building a smaller wood landing at the stairs rather than full porch.

Outdoor Carpet

Conceal worn concrete with outdoor synthetic turf carpet for softness underfoot.

Remodel Concrete Porch

For ideal upgrade, remove old concrete entirely and pour fresh foundation and finishes.

Stone or Tile Surface

Achieve high-end style with natural stone or encaustic tile overlay.

Depending on budget, scope of project, and home style – there are pros and cons to each approach that should be weighed.

Conclusion

Constructing a new wood deck or porch over an existing concrete foundation is an effective way to enhance curb appeal and update your home’s exterior. With proper planning for structural considerations, material selection, and execution, this project can yield beautiful results. The key is hiring experienced contractors to handle technical steps like ensuring adequate support and weatherproofing. Completed properly, you can enjoy an outdoor living space that provides charm and functionality for decades to come. An overlay porch allows you to salvage the current concrete slab while giving your entryway a fresh new look and added character.