Xintai Village, Zhongtai Town, Yuhang District, Hangzhou

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building waterproofing material

Roofing Underlayment

PVC waterproof membrane

Short description:

the next-generation product that provides superior performance and value for our customers who want the best of both worlds in roofing underlayment materials. The proven protection of an asphaltic-based underlayment is matched with synthetic elements to add safety and durability.
The hybrid technology combines asphaltic polymer & synthetic fabrics for proven performance…

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Product Details

Our roofing underlayment combines the proven technology behind asphalt-based underlayments
with a new high-performance nonwoven polyester reinforcement.
The durability enables our underlayment to hold fasteners better and provide better tear strength and puncture resistance than synthetics or felt.
our roofing underlayment un-rolls nice and flat in warm and cold weather weighs less than felt and provides greater coverage per roll, which all means time saved during installation. SafeGuard30 is the real roofers’ choice.

roofing underlayment installation

A lightweight, easy-to-handle, nicely rolling, underlayment. Easy to install, and you get 4.5 squares to a single roll.
Consistently outperforming conventional felts, Preferred to the new synthetics, SINOMTC roofing underlayment delivers.

The advantage of SINOMTC roofing underlayment


When properly installed, will not shrink, wrinkle, or bubble! Safer, Better traction than felt – and synthetic underlayment. 


SINOMTC ROOFING UNDERLAYMENT is a next-generation product that provides superior performance
You get all the proven protection of an asphaltic-based underlayment matched with synthetic elements to add safety and durability. The hybrid technology combines asphaltic polymer & synthetic fabrics for proven performance.


Than a conventional 30 Lb. When given the choice, real everyday roofers consistently choose SINOMTC ROOFING UNDERLAYMENT Hybrid underlayment to work with.


Easier & faster to install than other products, Twice the coverage than 30 Lb. felt. You get 4.5 squares for a single roll. When properly installed, will not shrink, wrinkle or bubble!

Installation Instructions of SINOMTC Roofing Underlayment

Special Notes:

1. Decks should be dry before application.
2. Unroll and use regular asphalt felt underlayment.
3. Underlayment may be applied at any temperature that it is safe for the applicator to work.
4. Underlayment should be installed with Logo (SINOMTC ROOFING UNDERLAYMENT) facing up, SINOMTC ROOFING UNDERLAYMENT Can be left exposed if properly installed for up to 180 days.
5. SINOMTC ROOFING UNDERLAYMENT fastening requirements:
a. Use 1″ minimum diameter plastic cap or 1″ minimum diameter no more than 18″ centers on edges and 24″ centers in the field of the underlayment.
6. These are the minimum acceptable application instructions. More stringent requirements of the building codes should be followed. For further details, see the ARMA Residential Asphalt Roofing Manual.
7. If the underlayment is exposed for less than 48 Hours standard all staples are acceptable. But do not staple on the field.

• Standard Slope (4/12 and greater)

After the deck has been properly prepared, cover it with one layer of SINOMTC underlayment. Lay the SINOMTC parallel to the eaves, lapping each course at least 2″over the underlying course. If two or more pieces are required to continue a course, lap the ends at least 4″. End laps in the succeeding course should be located at least 6′ (foot) from the end laps in the proceeding course. Lap the SINOMTC 6″ from both sides overall hips, valleys, and ridges. Where the roof meets a vertical surface, carry the SINOMTC 3” to 4″ up the surface.

Low Slope (2/12 up to 4/12)

Cover the deck with two plies of SINOMTC overlapping 19-1/2”. Begin by fastening a 19-1/2″ wide strip of SINOMTC placed along the eaves. Place a full 37.25″ wide sheet horizontally along the eaves completely overlapping the starter layer. All succeeding courses will be a minimum of 37.25″ wide and should be positioned to overlap the proceeding course by 19-1/2″.

For all slopes, when there is a possibility of ice buildup along the eaves or a backup of water from pine needles or leaves, follow the above low slope guidelines to a point at least 24″ beyond the interior wall line of the building. Thoroughly cement between the layers using asphalt roofing cement conforming to ASTM D 4586. The cemented double-ply underlayment serves as the eave flashing. After completing the eave flashing, secure each successive course as described above in the fastening requirements section until the final roof covering is applied.

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