I see that taping is an option for this flooring but is it better for the microclimate to not tape it?

Hello! Since the underlayment is designed as Water Vapor system, it has an ability to "breathe" no matter if tape is there or not (air is going through all the surface). Tape might be used on joints if desired to fix the Underlay and prevent moving while installing, tape could be used on full length of joints, by small pieces or could be not used at all.

I'll be installing this on a concrete slab and want to know if I can use it in a bathroom underneath tile or marble floors?

We recommend using our Underlayment under the floating floors. In the bathrooms, you can use it in places where there is no direct water exposure to the finishing surface. Our clients do install STEICO Underlayment under tile but we have not accumulated enough experience yet to recommend using it this way.

I need 3mm in addition to the 1/4 inch that the Steico underlayment provides. Can I use a 3mm foam vapor barrier underneath to make up the difference?

The thicker the layers, the spongier they get. The more movement, the less wear. I think layer them would be a mistake.

The 1/th and 1/4inch versions of this list the same delta iic. how is this possible? why is thicker better?

Dear James, thank you for the great question! To be honest, we were also very surprised when we received the results of the testing. We have been explained that during the testing various materials perform differently within different structures. Testings with our products (both 1/8" and 1/4") were done according to the toughest requirements ( 6' concrete slab and no ceiling assembly). Apparently with the wood fiber materials and in this particular setting, it does not make a significant difference for the soundproofing which thickness do you select ( 1/8" or 1/4"). Thicker wood fiber underlayment is commonly used when the elevation of height is needed or the subfloor is uneven. We hope it help!

Manufacturer	STEICO
Part Number	PR16005956
Product Dimensions	60.96 x 8.89 x 91.44 cm; 9.98 kg
Item model number	PR16005956
Size	6mm 1/4 Inch
Colour	Green
Finish	Natural
Shape	Round
Item Package Quantity	1
Number of Pieces	15
Maximum Pressure	21.32 Pound per Square Inch
Coverage	90 sqft
Special Features	100% natural product. No carcinogenic emissions, Sum SVOC: 0 mg/m3, produced without adhesives containing formaldehyde., Available in sheets of 3x2', 15 sheets per pack., Compensates on small floor unevenness of up to 3mm., Ecologically and environmentally friendly., Excellent airborne and impact sound insulation with Δ IIC 25 (The dB rating difference between a floor measured with an underlayment and with no underlayment)., High compressive strength of up to 21.32 psi that Protects the click-lock system of laminate and engineered floors., Ideal for use with underfloor radiant heating systems., Improvement of the acoustics., Made in Europe., Quick and easy to install., Recyclable., The wood comes from sustainably cultivated forests and is certified independently according to the guidelines of the FSC® (Forest Stewardship Council®)., Water vapor open., Wood fiber insulation board produced in accordance with EN 13986 and EN 622-4 and with ongoing quality supervision.
Batteries included?	No
Batteries Required?	No
Item Weight	9.98 kg

STEICO Wood Fiber Flooring Underlayment for Laminate Vinyl LVT LVP Hardwood Floor 6 mm 1/4 inch 90 SqFt Natural Sound Insulation Barrier

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