DensShield is a high-performance cement-based backerboard designed for tile installations in wet areas such as bathrooms, showers, and laundry rooms. Its unique formulation includes a fiberglass mat facing and a specially treated core that provide superior water resistance, mold resistance, and durability compared to traditional drywall or cement board. When installed correctly, DensShield creates a stable, waterproof substrate that ensures long-term performance and aesthetic appeal for tiled surfaces.
This article provides a comprehensive guide to installing DensShield backerboard, including preparation, step-by-step installation instructions, compatibility with various substrates, and important considerations for ensuring a successful tile installation. All details are derived from official documentation and manufacturer guidance provided by Georgia-Pacific, the company behind the DensShield product line.
Key Features of DensShield Backerboard
DensShield backerboard is engineered to address the specific challenges of tile installation in moisture-prone environments. The following features make it a preferred choice among contractors and DIY users alike:
- Water Resistance: DensShield is not fully waterproof but offers excellent resistance to moisture and water penetration. Its fiberglass-reinforced structure and treated core prevent mold growth and water damage when properly sealed.
- Mold and Mildew Resistance: The board’s composition inhibits the growth of mold and mildew, making it ideal for use in bathrooms and other damp areas.
- Strength and Stability: With high compressive and flexural strength, DensShield provides a rigid and durable base for tile, reducing the risk of cracking or warping.
- Ease of Installation: Unlike traditional cement backerboard, DensShield is lightweight and can be cut easily with a utility knife. This simplifies the installation process and reduces labor time.
- Compatibility: DensShield can be installed over wood or metal studs and is compatible with a wide range of tile types and adhesives.
- Warranty Coverage: The product is backed by a limited lifetime warranty, covering manufacturing defects under proper installation and use conditions.
Preparing the Substrate
Before installing DensShield, it is essential to prepare the underlying surface to ensure proper adhesion and long-term stability. The following steps outline the key considerations for various types of substrates:
Wood Framing
- Framing Spacing: Ensure wood studs are framed at 16 inches on center (o.c.). This spacing provides adequate support for the backerboard.
- Surface Condition: Studs should be straight, plumb, and free of warping. Any rough or uneven areas should be sanded down for a smooth finish.
- Moisture Barrier: Install a waterproof membrane or vapor barrier over the studs to prevent moisture from seeping into the framing.
Concrete
- Curing and Leveling: Concrete must be fully cured and structurally sound. Use a leveling compound to fill cracks or uneven sections that exceed 1/8 inch in depth.
- Surface Preparation: Remove any loose material, dust, or debris. Ensure the surface is clean and dry before proceeding with installation.
Existing Drywall or Greenboard
- Surface Cleanliness: Remove any wallpaper, paint, or adhesive residue. Sand rough areas and fill joints and holes with a setting-type compound.
- Priming: Apply a primer to the surface to enhance adhesion and promote a uniform base for the backerboard.
Existing Tile
- Surface Scarification: If installing over existing tile, scarify the surface completely using a masonry bit or similar tool. Fill any holes or uneven areas with tile adhesive or thinset mortar.
Proper surface preparation is critical to the success of the DensShield installation. A smooth, clean, and structurally sound substrate ensures that the backerboard adheres properly and remains stable under the weight and pressure of tile installation.
Step-by-Step Installation Guide for DensShield 4×8
The following procedure outlines the installation process for DensShield 4×8 backerboard, which is commonly used for wall and floor applications. These steps are based on manufacturer recommendations and should be followed carefully to ensure optimal performance.
Step 1: Plan and Measure
- Layout Planning: Begin by planning the layout of the DensShield sheets. Ensure that the boards are placed vertically with seams staggered to distribute stress evenly.
- Cutting: Use a utility knife with a carbide-tipped blade to cut the boards to size. Score and snap the board along the desired line for a clean, precise cut.
- Allow for Waste: Account for 10–15% extra material to cover cuts, waste, or mistakes. Each 4×8 sheet covers 32 square feet.
Step 2: Install DensShield Over Studs
- Vertical Installation: Attach the boards vertically to the wall studs using 1 1/4-inch backerboard screws. Screws should be spaced 8 inches apart along the edges and 12 inches apart in the field.
- Seams and Gaps: Ensure that seams are staggered and that any gaps wider than 1/16 inch are sealed with silicone sealant or a setting-type compound.
Step 3: Tape and Seal Seams
- Fiberglass Mesh Tape: Apply fiberglass mesh tape over all seams and corners. This reinforces the joints and prevents cracking.
- Setting-Type Compound: Use a setting-type compound (also known as a mud compound) to cover the tape and fill any imperfections. Allow the compound to dry completely before proceeding.
- Multiple Coats: Apply additional coats of compound if necessary, ensuring that the surface is smooth and level.
Step 4: Apply Waterproofing Sealant
- Sealant Application: Apply a waterproofing sealant to all seams, corners, and fastener indentations. This step is crucial for preventing water intrusion and ensuring long-term durability.
- Allow Drying Time: Let the sealant dry completely according to the manufacturer’s instructions before proceeding with tile installation.
Step 5: Install Tile and Grout
- Tile Adhesive: Use the recommended modified thinset adhesive for tile installation. Spread the adhesive evenly using a notched trowel.
- Tile Placement: Press the tiles firmly into the adhesive, ensuring proper alignment and spacing. Use tile spacers to maintain even grout lines.
- Grouting: After the adhesive has cured, apply grout using a rubber float. Work the grout into the joints and wipe away excess with a damp sponge.
- Seal Grout: Once the grout has dried, apply a grout sealer to protect against stains and moisture absorption.
Step 6: Final Sealing and Inspection
- Seal Penetrations and Fixtures: Apply waterproof sealant around penetrations, fixtures, and changes in plane to ensure full water resistance.
- Final Inspection: Inspect the installation for any gaps, uneven areas, or imperfections. Address any issues before the project is completed.
Following these steps ensures that DensShield functions as intended, providing a stable and waterproof base for tile in wet areas. It is important to adhere to the manufacturer’s guidelines and allow sufficient drying time between steps to avoid compromising the integrity of the installation.
Step-by-Step Installation Guide for DensShield 5/8
For DensShield 5/8, the installation process is similar but includes a few additional considerations due to the thinner profile and slightly different application requirements. The following steps provide a concise overview:
Step 1: Framing and Moisture Barrier
- Framing: Ensure that wood or metal studs are framed at 16 inches on center.
- Moisture Barrier: Install a waterproof membrane or vapor barrier over the studs to prevent moisture from seeping into the framing.
Step 2: Cut and Fasten DensShield
- Cutting: Use a carbide-tipped scoring knife to cut the boards to size.
- Fastening: Attach the boards horizontally to the studs using 1 1/4-inch backerboard screws, spaced 8 inches apart along the edges and 12 inches in the field.
Step 3: Seal Seams and Fasteners
- Seams and Gaps: Seal any gaps wider than 1/16 inch with silicone sealant.
- Fastener Heads: Spread tile adhesive over all screw heads to cover them and prevent water intrusion.
Step 4: Reinforce Corners
- Fiberglass Mesh Tape: Use fiberglass mesh tape to reinforce inside and outside corners. This helps prevent cracking and ensures structural integrity.
Step 5: Tile Installation
- Tile Adhesive: Apply modified thinset adhesive using a notched trowel.
- Tile Placement: Press the tiles into the adhesive, ensuring proper alignment and spacing.
- Grouting: Apply grout and wipe away excess with a damp sponge.
Step 6: Final Sealing
- Seal Penetrations and Fixtures: Apply waterproof sealant around fixtures, penetrations, and changes in plane.
- Final Inspection: Check the installation for any imperfections or gaps and address them before the project is completed.
This streamlined process is ideal for areas where thickness is a concern, such as tight corners or spaces with limited clearance. The thinner profile of DensShield 5/8 makes it a versatile option for many tile projects.
Where to Buy DensShield and Cost Considerations
DensShield boards are available at major home improvement stores and online retailers across the United States. The following are common sources for DensShield 4×8 and 5/8 boards:
- Home Depot: Offers both in-store and online purchasing options. Prices typically range from $50 to $65 per 4×8 sheet, depending on location.
- Lowes: Carries DensShield in stock at most locations. Pricing is generally comparable to Home Depot.
- Menards: Provides competitive pricing and often includes DensShield as part of tile installation bundles.
- Online Retailers: DensShield can also be purchased through online retailers such as Amazon, Build.com, and Wayfair. Prices may vary based on quantity and shipping costs.
For large projects, such as full bathroom or shower installations, it is advisable to purchase additional sheets to account for waste and cutting. A standard bathtub surround typically requires 3 to 4 sheets, while larger installations may require 6 or more. Buying in bulk can sometimes result in cost savings, particularly through online retailers or local suppliers.
DensShield Warranty and Coverage
DensShield is backed by a limited lifetime warranty provided by Georgia-Pacific, the manufacturer. The warranty covers manufacturing defects that result in leaks, deterioration, or failure of the product. Key conditions and exclusions include:
- Installation Requirements: The warranty is valid only if the product is installed according to the manufacturer’s guidelines.
- Storage and Handling: Boards must be stored and handled correctly to maintain warranty coverage.
- Replacement or Refund: Affected boards can be replaced or a refund issued for the original purchase price.
- Exclusions: Issues arising from improper maintenance, exposure to moisture, or surface damage are not covered.
- Non-Transferable: The warranty is not transferable and is only valid for the original installer or purchaser.
Before purchasing DensShield, it is important to review the full warranty terms with the seller or manufacturer. Proper installation and sealing are essential to maintaining warranty coverage and ensuring the product performs as intended.
Conclusion
DensShield backerboard is a reliable and high-performance solution for tile installations in wet areas. Its combination of water resistance, mold resistance, and durability makes it a preferred choice among professionals and DIY users alike. By following the manufacturer’s installation instructions and ensuring proper surface preparation, users can achieve a stable, waterproof base for their tile projects.
Whether installing DensShield 4×8 for larger wall and floor applications or DensShield 5/8 for tighter spaces, the process is straightforward and well-documented. The key to success lies in attention to detail, adherence to installation guidelines, and proper sealing of seams and fasteners.
With its limited lifetime warranty and proven performance, DensShield is a smart investment for any tile project that requires long-term durability and water resistance. By taking the time to learn and follow best practices, users can enjoy a beautiful, functional tile installation that stands the test of time.