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.

Installation

Underlayment Fastening Patterns and Lap Requirements

Underlayment failure is rarely a material defect. It is usually a fastening detail: too few fasteners, caps that are too small, or laps left unsealed. This page covers the attachment practice that keeps the sheet where it was put.

Fasteners

Choosing the fastener

Mechanically fastened underlayment is held with cap nails or, where permitted, staples with caps. The cap is doing the work — a nail without an adequate cap simply pulls through the sheet under load, which is why fastener pull-through resistance is a tested property of the sheet rather than an installation detail alone.

Use a cap large enough to distribute load; small caps concentrate it and pull through.
Use a shank length appropriate to the deck thickness — the fastener must bite into the sheathing, not just the sheet.
Corrosion-resistant fasteners where the exposure or local code requires them.
Follow the manufacturer's stated fastening schedule, which supersedes generic practice.

Spacing

Field versus lap spacing

Location	Typical spacing	Why tighter here
At laps	Closer spacing, often around 6 in on centre	The lap is where wind gets under the sheet first
In the field	Wider, commonly around 12 in on centre in rows	Holds the sheet flat without over-perforating it
High-wind regions	Manufacturer's enhanced schedule	Uplift pressure increases load per fastener

Treat the figures above as the shape of the practice rather than the rule: the governing number is always the one on the product's installation instructions, and it varies with the sheet and the wind zone.

Laps

Lap dimensions and sealing

Horizontal laps — a minimum overlap between courses, commonly at least 2 in for single-layer application on steeper slopes.
End laps — where two rolls meet along the same course, a wider overlap, commonly at least 4 in.
Sealing laps — manufacturer-approved tape or a self-adhered lap in wind-exposed regions; unsealed laps are the most common entry path for driven water.
Hips and ridges — carry the sheet over and fasten the top course, so water cannot enter at the termination.

Sequencing note underlayment should be installed from the bottom of the deck upward so that each course laps over the one below, which sheds water down the roof rather than into the seams.

FAQ

Common questions

Can I use staples instead of cap nails?

Where permitted, staples with caps are accepted in some jurisdictions and by some manufacturers, but cap nails are the more common specification and generally give better holding. Check the product instructions and the local code before substituting.

Why do laps need tighter fastening than the field?

A lap is a free edge that wind can lift. Fastening closer together along that edge reduces the sheet movement per fastener and makes it much harder for wind to start a peel that propagates across the roof.

Should laps always be taped?

Not always, but in high-wind and hurricane regions sealed laps are standard practice and often required. Where they are not required, follow the manufacturer's guidance rather than adding tape that may not be compatible with the sheet.

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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