Bellawood Platinum Underlayment™ Features & Benefits. For commercial and residential use. Installs over many existing floors or new substrates. Suitable over most types of industry-approved sub-floors. 1/8” (3mm) gauge. 100 sq. Rolls = 36” x 33.4’ retail size Bellawood Platinum Underlayment™ Product Specifications. Find helpful customer reviews and review ratings for BELLAWOOD Platinum Underlayment 100sft at Amazon.com. Read honest and unbiased product reviews from our users.
Installation Instructions: Rev Sept 18, 2020
USE: Platinum is a premium quality synthetic roofing underlayment designed for use in steep slope roofing as a secondary layer of protection. It is approved for installation over plywood or OSB roof decking with proper fasteners on roof slopes 2:12 and greater. Platinum is an air, vapor, and water barrier with <1 Perm and therefore should be installed above a properly ventilated space(s). Platinum replaces the use of #15 or #30 organic roofing felt and is designed for residential or commercial use under primary roofing materials such as; asphalt or synthetic shingles, metal, tile, slate, cement, and primed cedar shakes.
DECK PREPARATION: Platinum should be installed over a clean, smooth, and dry deck. The deck should be structurally sound and should not have any voids, protrusions, damaged or unsupported areas. For re-roofing projects, replace any water damaged sheathing and sweep roof deck thoroughly removing dust, dirt and loose nails. Do not install over old roof covering.
FASTENERS: For best performance and extended exposures greater than 1 day and up to 180 days Platinum should be installed with 1” diameter plastic or metal cap corrosive resistant roofing nails with 1” leg or greater (ring shank preferred), or 1” diameter plastic cap staples.
If Platinum is to be covered within 5 days by primary roofing and no driving rain or high wind events are expected it can be installed with corrosive resistant 3/8” head roofing nails with 1” leg or greater (ring shank recommended). In this case every other anchoring point in the field of the product is acceptable. If Platinum will be covered same day un-capped staples can be used provided no rain or high winds are expected. Note: Use of un-capped fasteners may result in blow off or leakage around fastener penetrations during a rain or high wind event.
For coastal areas and extended exposure conditions where driving rain or strong winds are expected it is recommended to take additional precautions such as doubling lap widths, adding an adhesive on overlaps, and/or taping all roof deck seams and/or underlayment overlap seams including the perimeter edges of the roof. For taping roof deck seams and perimeter edges consider FT Copperhead butyl roofing tape. For adhesive use a low solvent plastic roofing cement meeting ASTM D-4586 Type 1 or Federal Spec SS-153 Type 1, such as Karnak, Henry, DAP or equivalent.
APPLICATION: For slopes 4:12 and greater Platinum underlayment is to be installed horizontally (parallel to the eave) with the printed side up using the provided lap lines. Use 6” vertical laps and 4” horizontal laps. Underlayment to be installed in shingle lap fashion starting at the bottom edge of the roof deck to ensure that the water runs over the overlaps without getting under the material. Align the underlayment to the edge of the rake and eaves. Platinum should be applied under the metal drip edge along the rakes and over the metal drip edge along the eaves unless otherwise specified by local building codes. Do not fold Platinum over the roof edge unless this edge is to be subsequently covered over by a drip edge or other flashing material. Note: All end laps of succeeding courses should be offset by a minimum of 6 feet. Platinum to be fastened using the nail pattern as printed on the product. All anchoring must be performed snug and hammered flush and at 90 degrees to the roof deck, ensuring the material surface is held tightly with the roof deck. Do not install fasteners over unsupported areas/voids. Extend product a minimum of 12” past all hips and valleys, and lap up onto walls and abutments a minimum of 8”. For batten secured installations use appropriate length ring shank nails or screws to secure battens to the roof deck, staples are not recommended. Do not install battens over cap nails.
For low slope applications between 2:12 and 4:12 it is recommended to cover the roof deck with two layers of Platinum. Begin by installing a 24” wide strip along the eave with minimal fasteners. Then cover with a full 48” width of Platinum. Then overlap each successive course by 50% plus 1 inch. Vertical lap requirements are the same as in 4:12 and greater slopes. Note: Product is not recommended for slopes less than 2:12.
If installing an ice and water protection barrier it should be installed first along the eaves and in the valleys. It is recommended to use an ASTM D1970 approved waterproof membrane such as FT Platinum HTSA or Komodo BSA. For additional rake edge waterproofing apply a minimum 6” strip of adhesive backed roofing seam tape flush to the rake edge on top of the Platinum, then install the metal drip edge. Consider using FT Copperhead butyl roofing seam and flashing tape.
Platinum has 180 Day UV protection and is not designed for indefinite outdoor exposure. It is therefore recommended that installation of the primary roofing material be installed within 180 Days.
Platinum has 180 Day UV protection and is not designed for indefinite outdoor exposure. It is therefore recommended that installation of the primary roofing material be installed within 180 Days.
CAUTION – Read Good Safety Practice Below
As with any roofing product, always follow safe roofing codes & practices (OSHA) and always use and wear fall protection devices when working on roofs. Release liners are slippery and should be removed from work area immediately after application. Use caution when walking or standing on Platinum as slip resistance may vary with surface conditions, weather, footwear and roof pitch. Failure to use proper safety gear and footwear can result in serious injury.
Platinum HTSA Installation Instructions
Rev Nov 3, 2020
USE: Platinum HTSA is a high temperature, self-adhering, peel and stick roofing underlayment designed for use as secondary ice and water protection in steep slope (2:12 and greater) roofing applications. It offers premium protection against water infiltration from snow, ice dams, and wind driven rain. It is designed for use under most primary roofing materials such as residential or commercial metal, mechanically attached concrete or clay tiles, primed cedar shakes, and asphalt or composite shingles.
STORAGE:
For best results store Platinum HTSA upright in its original packaging in a well ventilated area at room temperature between 40°F (4.4°C) and 90°F (32°C). If product has been stored at a high temperature above 90°F (32°C) it may become difficult to remove the release liner backing. To correct this, move product to a cooler location. Once cooled, the release liner can be easily removed.
DECK PREPARATION:
Platinum HTSA should be installed over a clean, smooth, and dry deck. The deck should also not have any voids, protrusions, damaged or unsupported areas. For re-roofing projects, replace any water damaged sheathing and sweep roof deck thoroughly removing dust, dirt and loose nails. Do not install over old roof covering.
APPLICATION:
For best results Platinum HTSA should be installed when the air, membrane, and substrate temperature is over 40°F (4.4°C). Priming is not required when attaching to wood or OSB decks. Concrete or masonry decks should be primed with a solvent or water based primer that meets ASTM D41 for self-adhesive membranes. Membrane to be applied in shingle lap fashion working from the low point to the high point of the roof. Apply the membrane in valleys before the membrane is applied to the eaves. HTSA is to be laid out horizontally (parallel) to the eave with the printed side up. Horizontal overlaps to be 3” using the flat designated selvage edge. For best adhesion performance it is recommended to not overlap up onto the Gripspot walking surface. For end laps it is recommended to overlap a minimum of 6” and nail 1” in from the edge along the vertical end lap with 6” spacing between nails. To increase adhesion a primer can be used along end lap. End laps should be offset a minimum of 6 feet on adjacent courses. Where it is necessary to overlap Platinum HTSA onto the Gripspot walking surface such as over the ridge it is recommended to cap nail along the outer edge 1” in at 6” intervals. Note if underlayment will be left exposed for an extended period in high wind areas it is also recommended to nail along the outer edges of the roof along the rake or eave.
For easier installation, it is recommended to cut the membrane into manageable lengths. Then peel back one side of the split release liner and apply in position on the roof deck and then press in place by hand or with a weighted roller to increase adhesion to the deck. Once one side has been pressed to the deck peel back the remaining half of the release liner and press down to adhere to the roof deck again using a weighted roller to increase adhesion. For improved adhesion hand rolling over the selvage edge and directly above the selvage edge using a weighted roller is recommended. If a roller is not available or not considered safe, walk on all laps, and as much of the field area as possible.
For Cold Weather Applications 40°F (4.4°C) or below, a primer should be used and the upper most selvage edge blind nailed using 3/8” head roofing nails 1” or longer. Space nails along edge at 12” intervals using the marked locations. For best results, allow Platinum HTSA to ambiently warm to room temperature prior to application.
For Steep Slope Applications (5:12 or greater), high wind areas, or when installing at temperatures greater than 100°F (38°C), it is recommended to blind nail the selvage edge area as per above under cold weather application.
Platinum HTSA should be applied under the metal drip edge along the rakes and over the metal drip edge along the eaves unless otherwise specified by local building codes. Do not fold Platinum HTSA over the roof edge unless the edge is to be subsequently covered over by a drip edge or other flashing material.
In areas where ice damming can occur, install Platinum HTSA from the eaves up the roof to a point not less than 24 inches inside the exterior wall, measured horizontally. Consult your local building code for specific requirements.
For valley applications, peel the release liner; center the sheet over the valley and hand press in place from the center of the valley outward. Note: It is very important Platinum HTSA stay in contact with the roof deck into and out of the valley area. Platinum HTSA should never be suspended or bridge a valley. It is recommended to follow up with a weighted roller or by walking on the surface. Give special attention to ALL perimeter edge areas.
Repair holes, fish mouths, tears, and any other penetration damage to the membrane with a round patch of membrane extending passed the damaged area by 6 inches in all directions. Do not install fasteners through membrane over any unsupported areas of the structural deck, such as over joints between adjacent structural panels.
PRECAUTIONS:
Platinum HTSA is a moisture and vapor barrier and therefore must be installed above a properly ventilated space(s). Follow ALL building codes applicable to your geographical region and structure type. HTSA is not designed for indefinite outdoor exposure. Final roofing should be installed within 180 days of underlayment installation.
CAUTION – Read Good Safety Practice Below
Bellawood Platinum Underlayment 100sft
As with any roofing product, always follow safe roofing codes & practices (OSHA) and always use and wear fall protection devices when working on roofs. Release liners are slippery and should be removed from work area immediately after application. Use caution when walking or standing on Platinum HTSA as slip resistance may vary with surface conditions, weather, footwear and roof pitch. Failure to use proper safety gear and footwear can result in serious injury.