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hydra breathable

FT Synthetics HYDRA is a breathable synthetic roofing underlayment designed to add an extra layer of protection from water penetrating your roof, and at the same time help the release of trapped moisture due to poor attic ventilation. HYDRA is designed with an internal monolithic membrane. This structure provides outstanding vapor permeability using an advanced chemical transfer of water vapor and acts as a liquid water barrier under all weather conditions. HYDRA includes our slip-resistant GRIPSPOT™ technology top surface for superior walkability and HYDRY™ technology for faster roof deck drying.

HYDRY™  Technology*

Now features our exclusive HYDRY™ technology designed to tackle the problem of water on the roof deck during installation. Non-breathable synthetic roofing underlayments will trap liquid water on a roof deck which can quickly lead to mold growth and possible roof deck rot. Other breathable roof underlayments don’t perform much better and are slow to move liquid water from the deck. HYDRY technology quickly absorbs water from the deck and transfers it at a rate 15 times the leading breathable synthetic underlayment in the market and 10 times traditional #30 felt.

  • NEW HYDRY technology for:
          Rapid roof deck drying
          Reduction in mold  growth
          Helping prevent roof deck rot
  • GRIPSPOT Technology for superior slip resistance
  • Durable breathable three-layer construction
  • Safe and easy installation
  • 180 day UV resistant
  • Does not wrinkle or curl
  • Low-temperature flexibility
  • 6x stronger and 5x lighter than traditional #30 felt
  • LIFETIME limited warranty

HYDRA Meets or exceeds the following code standards: ASTM D226-97, ASTM D4869, CAN/CSA A123.3, FBC #FL20853, CAN/CSA, A220.1, ASTM E108, CCRR 1028, AC188, TDI, RCABC RoofStar, California Building Code Compliant

WIDTH48″ (1.22 M)
LENGTH125′ (38.1 M)

Test and StandardFT SYNTHETICS HYDRA#30 Felt
Material Composition
UV Resistance6 MonthsNA
ASTM D226 Type I & IIMeets and ExceedsMeets
Water shower Exposure ASTM D 4869
Permeability ASTM E96-B
30 Perms
5 Perms
Permeability ASTM E96-BW
150 Perms
15 Perms
Deck-Side Water Absrbency in 10 Min35g/m^2NA
Temperature Range 
-40°F to 240°F
Nominal Thickness ASTM D1777 
30 mils / 0.76 mm
60 mils / 1.54 mm
Slip Resistant Surface
Class A Fire ASTM E108PassNA
The Data shown above is based on the test averages and independent test reports. There can be a +/-10% variation in the individual test results. This report should not be considered as a warranty for the manufacturer. The manufacturer is not responsible for the misrepresentation or misinterpretation of the data by the reader. Please find out more about the product by calling 1-844-353-9839 or visit www.ftsyn.com


Installation Instructions:                                                       Rev Sept 18, 2020

USE: HYDRA is a premium quality breathable 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. HYDRA is ideal for breathable roof systems such as metal, tile, slate, and cedar shingles, but can also be used under asphalt or synthetic shingles.

DECK PREPARATION: HYDRA 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 HYDRA 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 HYDRA 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 HYDRA 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 HYDRA 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.  HYDRA 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 HYDRA 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. HYDRA 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 HYDRA. Begin by installing a 24” wide strip along the eave with minimal fasteners. Then cover with a full 48” width of HYDRA.  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 HYDRA, then install the metal drip edge.  Consider using FT Copperhead butyl roofing seam and flashing tape.

HYDRA 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 HYDRA 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.


hydra Dual logo program

Take advantage of low-cost marketing with our HYDRA Dual Logo Program and receive majority branding alongside our own logo and contact information. You’ll be recognized in your community as a leader in sustainable roofing practices and gain valuable exposure. 

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