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Welcome to the Frequently Asked Questions blog by NUDURA Insulated Concrete Forms. Here is a great spot to review and be part of the conversations on FAQs about NUDURA ICFs. Be sure to check back regularly!


Down to the Finish: Attaching Siding, Drywall and More after a Perfect Cut

by NUDURA Blogger | Jun 13, 2016

NUDURA forms are designed to make measuring as easy as possible for the installer. 

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Each interlock along the top and bottom of the form is 1 inch, the score line on the outside of the form panel denotes 2 inches, and fastening strips are located every 8 inches (200mm) on center.

Indicated on the surface of the form by a diamond pattern, these fastening strips are continuous up the full height of the form unit, and have a patented mechanism that interlocks one fastening strip to the one below or above. The strips are 1 ½ inches wide and have a higher pull out strength than a dimensional stud.

Use the three above measurements to find where you need to make your cut to achieve your desired length of wall.

It’s important to remember that different types of cladding will have different installation procedures. For vinyl siding, you will want to use a standard #6 x 1 ½” to 1 ¾” coarse thread, ‘bugle’ style or ‘flute’ head (1/4 inch diameter head) zinc coated or other non-corrosive screw.

NOTE: As inexpensive as they are, drywall screws with the black sulphur coating will eventually corrode.

Equally useful are standard bright (i.e. chrome) finish #6 x 1 ½” pan-head, coarse thread self-tapping screws. As an added bonus, these can be used for a multitude of anchorage purposes besides siding fastening, and do not corrode as easily as drywall screws.

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  1. Tom | Dec 02, 2017

    Looking into LP Smart Side manufactured wood siding they do not recomend using their product on icf or sip panels as they may buckle or shrink. My question is why would icf or sip panels cause LP Smart Siding to have possible performance issue where they will not warranty their product if used on those surfaces. Are you aware of other siding products that should not be used onan ICF wall?

    According to the current LP Smartside Lap Siding Installation Instructions this product CAN be installed over an ICF. We have spoken with their technical representatives to confirm this is accurate. They have alternative fastening instructions listed for the use of screws instead of nails, which can be found on the LP website. NUDURA has tested the use of a comparable screw as identified in these instructions and it is well above the minimum stated in LP’s installation instructions. Insulated Concrete Forms do not shrink or warp over time, the reinforced concrete core does not allow movement after curing. ICF’s provide an ideal backing for any interior or exterior finish.

    - NUDURA Blogger | December 4, 2017

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