Perforated Base Insulation Pins
Perforated Base Pins also known as "Perf Pins" or "Spindles" are used to securely fasten insulation boards, wraps, and batts to walls and ceilings. Perf-Pins have a 2" square base which is perforated to allow pin adhesive to form a secure grip. Boss 180 Mult-Seal Pin Adhesive is a Low-VOC option for adhering perforated base pins to wood, masonry walls, sheet metal ductwork, metal building walls/ceilings, etc. In some installations the base of the perf-pins may be fastened directly to the structure by fastening through one of the holes in the base. Many times when installing on wood, a single screw or nail will provide secure hold instead of the use of adhesives.
Once the Perforated Base Pins are securely installed with either pin adhesive or fastener, the insulation can be pierced onto the pins. Once pierced, the insulation will be held in place with the use of a lock washer. Lock washers come in many shapes and sizes for various applications. Please note that washers are usually sold separately unless the product notes "with washer".
Perf-Pins come in a wide variety of sizes up to 12-1/2" long! The pin length should always be longer than the thickness of the insulation product. For rigid board insulations it is a must to be 1/2" longer than the board thickness to allow proper lock washer install. For batts and wraps which are more compressible, a longer pin is still recommended to avoid compression (reduces R-value). If a batt or wrap is installed with a shorter pin, the installation will work however you will get a tufting appearance at the washers. Excess pin length can be cut with a Channelock End-Nipper after the lock washer is installed.
Pin spacing can vary depending on the application. If the perf-pins and fasteners are installed with adhesive, the manufacturer recommendation is a grid layout of 1 pin every 12" in each direction (basically 1 pin per sf). This can be adjusted depending on the thickness and weight of the insulation, wall vs. ceiling, etc. If using pin fasteners instead of adhesive, the amount of pins can be reduced however sagging of non-rigid insulation must be considered in the layout design.