Can we get samples before placing a bulk order?

Yes. Sample rolls ship by courier so your team can handle the product, check the print and run it on a test deck before you commit. Tell us which series and grammage you want to evaluate and we will arrange the shipment.

Can you print our own brand on the roll?

Yes — private-label printing is a standard part of the programme. Your logo, lap and nailing guides, contact line and safety wording can all be printed in line during production. Print plates and minimum quantities are confirmed per item.

What is the minimum order quantity?

Minimum order is one pallet (56 rolls), on any specification, for both factory-direct and US warehouse shipments. Send us your target roll spec — width, length, grammage and print — and we will confirm the MOQ for that item.

Do you supply test reports with each shipment?

Yes. Test reports are issued per order and travel with the shipping documents. If your market requires third-party testing or a specific standard, raise it at quotation stage so the test plan is agreed before production begins.

Can we audit the factory or send a third-party inspector?

Both are welcome by appointment. Let us know the scope — checklist, standard or customer requirement — and we will have the relevant batch records and production staff available on the day. Remote video walk-throughs can also be arranged.

Which markets do you export to?

We supply distributors, contractors and private-label partners across North America, Europe and Asia-Pacific, with selected lines held in US and EU warehouse stock. Contact the sales desk to confirm current availability for your destination.

Climate

Underlayment for Hot and Humid Climates

Two things define a hot-humid roof: the assembly needs to dry, and the underlayment may sit exposed to intense overhead sun for longer than anyone plans for. Pick the wrong sheet and you get a deck that stays wet, or a sheet that degrades before the shingles arrive.

Vapour

Why permeance is the first question

In a humid climate the moisture drive is often from outside inward, and the deck needs a path to dry rather than a barrier that traps whatever moisture gets in. A sheet with very low permeance over the whole roof can turn a manageable amount of incidental moisture into a long-term problem.

Ask for water vapour transmission with the test method — it is a required test under ASTM D8257 and is frequently omitted from marketing data sheets.
Do not assume two sheets with similar weight or thickness have similar permeance; the coating and laminate structure drive it.
Keep low-permeance membranes for the locations where they belong — eaves, valleys, penetrations — rather than the whole field.

Exposure tolerance before the finish course

Material	Typical UV exposure tolerance	Practical implication
Asphalt-saturated felt	Days	A weather delay of a week or more can require replacement
Synthetic underlayment	Weeks to a few months depending on product	Tolerates the realistic delay between dry-in and shingle delivery
Self-adhered membrane	Product-specific, generally shorter than synthetic	Cover promptly; do not use as a long-term exposed layer

This difference is one of the main reasons synthetics displace felt in humid regions, where afternoon thunderstorms and schedule slippage are routine. Always read the manufacturer's stated exposure limit for the specific product rather than relying on a category average.

Handling

Lay-flat behaviour in humidity

Organic felt absorbs moisture and can wrinkle and buckle as it takes up water, which telegraphs through the shingle course. A synthetic sheet does not absorb, so it stays flat in humid conditions and produces a cleaner finished roof. For a contractor working through a wet season, that is often the difference between a callback and none.

Slip resistance is the related property worth checking: a textured walking surface matters on steep roofs, and in a humid climate the surface is more likely to be wet when crews are on it.

FAQ

Common questions

Should I use a radiant barrier in a hot-humid climate?

Hot-humid regions are typically cooling-dominated, so a radiant barrier at the deck or rafters can reduce radiant gain meaningfully. It must face an air space to work, and it does not replace attic insulation.

Is a higher permeance always better?

Not universally. Higher permeance helps the deck dry, but it can come at the cost of water holdout and the two need balancing. The right target depends on the assembly and whether the interior side is conditioned.

How long can synthetic underlayment really sit exposed?

It varies substantially by product and is stated by the manufacturer as a defined exposure period. Treat that figure as a hard limit and read it from the current data sheet rather than assuming a category-wide number.

Need the spec sheet behind the claim?

Tell us the product, roll spec and destination. We will send the current data sheet, test reports and a quotation against your actual requirement.

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