Complete Step-byStep Installation Guide w/ Commentary
TLDRThis guide outlines the essential steps for installing a waterproof deck system. It emphasizes the importance of a properly sloped substructure, adhering to building codes, and using specified materials for joists and decking. The process involves meticulous preparation, including cleaning and patching the deck surface, before applying the membrane. Attention to detail is crucial when sealing edges, corners, and intersections with specialized flashings and ensuring expansion gaps. The guide also instructs on applying adhesive and heat welding techniques for a seamless and watertight finish, highlighting the significance of not applying adhesive to welding areas.
Takeaways
- 🏗️ Ensure the substructure has a 2% slope for proper watershed.
- 🔍 Use a golf ball to test the slope and inspect the structure for code-compliant joist spacing.
- 🛠️ Install floor joists a maximum of 16 inches on center and use a minimum 5/8 inch CDX exterior grade plywood.
- 🔨 Mark and properly countersink screws for secure fastening without compromising the deck's integrity.
- 🧱 Clean the deck surface thoroughly to prepare for the installation of decking materials.
- 💧 Install a perimeter drip edge flush with the decking to control water flow.
- 🛑 Apply deck patch to eliminate voids and cracks, but avoid covering screw heads or drip edge metal.
- 📏 Measure and mark for a 1-inch overhang at the rim joist to ensure proper membrane application.
- 🔄 Check for color consistency and roll the membrane in the same direction to maintain uniformity.
- 🔧 Install pre-formed deck corners at critical leak areas like deck-wall intersections for added protection.
- 🚿 Cut and install a drain through the substrate, ensuring it seats flush and is secured properly with construction adhesive and fasteners.
Q & A
What is the recommended slope for a substructure to ensure positive watershed?
-The recommended slope for a substructure to ensure positive watershed is 2%.
How can you test the slope of a substructure?
-You can use a golf ball to test the slope of a substructure.
What is the maximum spacing allowed between floor joists according to the script?
-The maximum spacing allowed between floor joists is 16 inches on center.
What type of plywood is recommended for the decking, and what is the minimum thickness?
-The recommended type of plywood for the decking is exterior grade tongue and groove, and the minimum thickness is 5/8 inches CDX.
How should the screws be installed on the exterior grade tongue and groove decking?
-The screws should be glued and screwed with screws maximum 8 inches on center.
What is the purpose of cleaning the deck surface before installation?
-The deck surface should be cleaned to prepare for the proper application of deck patch and to ensure the surface is smooth and free of any imperfections.
How should the deck patch be applied to the surface?
-The deck patch should be carefully mixed according to the instructions on the package and applied to all cracks, joins, and imperfections. No more than 1/4 inch should be applied on top of the drip edge.
What is the recommended method for installing pre-formed deck corners?
-Pre-formed deck corners should be installed at all critical leak areas, such as deck wall intersects, by trimming off unwanted material and nailing them in place.
How should the drip edge be secured to the substructure?
-The drip edge should be placed over the deck corner and secured to the substructure using 1 and 1/2-inch ring nails in a staggered pattern approximately 4 inches on center.
What is the process for installing a drain through the substrate?
-A 5-inch hole should be cut through the substrate, the drain centered in the hole, and a generous bead of construction adhesive applied to the underside of the flange. The flange is then seated flush to the plywood and secured using suitable fasteners 2 inches on center.
How should the membrane be applied to the deck and up the walls?
-The membrane should be applied onto the adhesive, rolled out to remove bubbles, and adhered to the substrate. It should then be flashed up the wall a minimum of 6 inches, with care taken to apply adhesive liberally on the wall for good membrane to wall adhesion.
What is the welding process for the membrane, and what precautions should be taken?
-The welding process involves a two-pass system: a pre-weld to ensure watertight integrity and a finish weld to seal the outer edge of the seam. Care should be taken to avoid applying adhesive to the weld areas, and the membrane should be heat-welded to the Scupper and any other areas as per the manufacturer's instructions.
Outlines
🛠️ Deck Preparation and Installation
The first step in deck construction involves ensuring a solid substructure with a 2% slope away from the building for effective water drainage, which can be tested using a golf ball. The substructure must adhere to local building codes, including specific measurements for joist spacing and plywood thickness. After confirming these parameters, decking should be properly glued and screwed. Additionally, marking screw locations with chalk ensures proper placement and countersinking. Perimeter preparation for drip edge installation and thorough cleaning of the deck surface are also critical. The application of deck patch is used to address any surface imperfections, ensuring a smooth finish suitable for further installation steps.
🔧 Detailed Installation Techniques
This section focuses on precise installation techniques, starting with cutting and setting up a drain system flush with the deck surface. It describes the use of construction adhesive and fasteners to secure the drain. The installation of the membrane includes meticulous steps like cutting around the drain, welding, and ensuring all parts are oriented correctly. The use of adhesives is highlighted, specifying techniques for effective application and ensuring that surfaces to be welded are not coated with adhesive. Multiple layers of the membrane are applied with overlaps and specific orientations to ensure a secure, waterproof deck surface.
🔨 Advanced Membrane and Flashing Techniques
Advanced techniques for membrane installation involve applying adhesive and ensuring all edges and overlaps are flush and secure. Emphasis is on the meticulous application of solvent-based adhesive to achieve a robust membrane-to-wall adhesion, and special attention is given to corners and intersections where additional reinforcement is necessary. The use of pre-formed deck flashing and cutting techniques are described to ensure precise fits and secure seals, particularly around critical areas like deck-wall intersections and sill areas.
🏗️ Finalizing Installation and Detail Work
The final steps involve detail-oriented tasks such as heat welding to secure membrane corners and edges, which is crucial for waterproofing. Techniques such as folding and trimming the membrane, and securing the membrane up the walls are detailed. The importance of not applying adhesive in weld areas is reiterated, ensuring that all welded joints are executed perfectly. The process includes checking all seams and terminations with a special tool to ensure the integrity of the waterproofing system.
Mindmap
Keywords
💡substructure
💡joist spacing
💡plywood
💡tongue and groove decking
💡drip edge
💡deck patch
💡Dect Tech
💡expansion and contraction
💡heat welding
💡WBA 100 adhesive
💡Scupper
Highlights
Ensure substructure has a 2% slope for positive watershed.
Use a golf ball to test the slope of the substructure.
Inspect the structure from underneath to confirm joist spacing complies with local building codes.
Floor joists should be a maximum of 16 inches on center.
Plywood should be a minimum 5/8 inch CDX for structural integrity.
Exterior grade tongue and groove decking should be glued and screwed with screws at a maximum 8-inch center.
Mark screw locations with chalk for proper countersinking.
Clean the deck surface thoroughly in preparation for installation.
Use deck patch to eliminate all voids and cracks on the surface.
Measure and mark 75 inches from the edge of the deck for a 1-inch overhang.
Install pre-formed deck corners at critical leak areas like deck wall intersects.
Place deck clad drip edge over deck corner and secure it using 1.5-inch ring nails.
Join drip edge pieces with a 1/8-inch gap for expansion and contraction.
Install the drain by centering it in the hole and securing it with construction adhesive and fasteners.
Apply WBA 100 adhesive and spread it using a 1/16 inch x 3/8 inch V-notch roller.
Apply SBA 100 solvent-based adhesive for a dry surface and coat the entire deck surface with two layers.
Mark weld areas and ensure no adhesive is applied to wood surfaces or areas to be welded.
Roll the membrane onto the adhesive, roll out bubbles, and ensure it is flush to the pencil lines.
Flash the membrane up the wall a minimum of 6 inches and adhere it with SBA solvent-based adhesive.
Use 3-inch foil tape to seal the top of the wall flashing closed to avoid water intrusion.