Shop

The Low-E ThermaSheet Roofing Underlayment 1/8″ x 4′ x 125′ is a felt underlayment for jobs that require Low-E model/MPN 4LMPX in the RL sell unit. Low-E ThermaSheet Insulated Roofing Underlayment provides a thermal break between the blazing heat of the sun and your cool air conditioned house.

Key Specs

• Brand: Low-E
• Model / MPN: 4LMPX
• SKU: LOW4LMPX
• Sell unit: RL
• Product type: Felt Underlayment
• Size / color: 1/4″ x 4′ x 125′
• Category: Residential Roofing | Residential Roofing/Underlayment | Residential Roofing/Underlayment/Felt Underlayment | Underlayment | Underlayment/Felt Underlayment

Key Features

• Faster installation
• Versatility
• ThermaSheet is available in both 1/4 and 1/8 thicknesses

Coverage & How Much You Need

Coverage or yield is not specified in the available product details. Use the manufacturer installation instructions and project takeoff before converting the job size into order quantity.

Compatibility / Fitment

Use this item only when the brand, model/MPN, size/color, sell unit, and system type match the project specification. Do not substitute it for a different felt underlayment, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

Low-E ThermaSheet Roofing Underlayment 1/8″ x 4′ x 125′, sold as RL, with SKU LOW4LMPX and manufacturer model/MPN 4LMPX.

What model or part number should I match?

Match model/MPN 4LMPX and confirm the brand is Low-E. If the job spec lists a different model, size, color, or system family, hold for review.

What unit is the price based on?

This listing is built around the RL sell unit. Confirm the unit before comparing price, quantity, or coverage.

How do I estimate quantity?

Coverage or yield is not specified in the available product details. Use the project takeoff and manufacturer instructions before estimating quantity.

What should be checked before purchase?

Confirm the model/MPN, sell unit, size/color, jobsite condition, compatible system components, and any manufacturer installation limits before approving the order.

Roofing and exterior-envelope work can involve fall hazards, weather exposure, fumes, adhesives, and system-specific installation requirements; follow the manufacturer instructions, OSHA-safe work practices, and local code or use a qualified contractor.

Product Expert Notes

Choose this item when Low-E model/MPN 4LMPX, SKU LOW4LMPX, and the RL sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.