The reason for using 1 1/2" 16 gauge nails was to minimize the risk of splitting the casing or breaking through the edge of the jamb extension. My reason for attempting 23 gauge pins was to avoid the risk of splitting the casing that near it's edge. After I've shimmed the casing to make sure it stays flat and square to the jambs, I'll install it with more robust nails. The underlying jamb extensions are the only true nailing surfaces to rely on (without re-floating the walls) and only present a 3/4" target less the reveal width, so whatever nail or brad is used, it must be put in very close to the edge of the casing. Whoever did the drywall back in 1973 should have been hung by his thumbs: the wall contours look like the sea with a little swell on it. The purpose of my using 23 gauge pins was not to install the casing but merely to hold it in place until I could shim it sufficiently to install it with 16 gauge nails further away from the reveal lines. I would not attempt to install this trim with pins. Gentlemen, Thank you all for your helpful responses. The Question: Does anybody have experience with pins in hardwoods of similar thickness (7/8" or so) to tell me whether the tool is wrong for the job or whether I'm doing it wrong? (NB the second photo is erroneously rotated so the ceiling is to the left) I finally gave up on pins for the job, switched to the gas gun and held my breath while nailing within 1/2" of the reveal line, just enough nails to hold the casing in place until I could get everything shimmed up. With pressures ranging from 110 to as much as 125 pounds I've repeatedly jammed my pin gun because the pin will stop proud of the casing surface by almost a 1/4" and then bounce back enough to jam the gun's ram, requiring a partial disassembly. The Problem: Grex recommends a compressor discharge pressure of 110 PSI for 1 3/8" or longer pins into hardwood. I have a Grex 650 pin gun that has served to pin the ceiling-to-wall White oak molding you see in the first photo atttached, without a problem. My plan was, however, before shimming and final nailing, to position and fasten the stile casings flush and square to the jamb extensions with two or three 23 gauge, 1 3/4" pins to avoid splitting the stiles by nailing too close to the reveal lines. My principal method of attachment of the casings to the jamb and jamb extensions is to nail them with 16 gauge 1 1/2" trim nails, using a Paslode gas trim nailer. Because the walls are wavy the stiles will need to be shimmed to the wall and the gaps concealed by a separate back band scribed to the wall. The casing stiles are 7/8" thick and installed on jamb extensions, both made of White oak. Trimmings for Kitchen & Bedroom manufacture.I'm building Craftsman style window trim from White oak. The range of pneumatic Omer tools are produced to the highest standard, and their exceptional build quality means that they are extremely reliable and easy to maintain, which also means that the repair, servicing and upkeep costs will be minimal. This Omer 23 Gauge B6.35 Nailer is also lightweight and easy to handle, meaning it is effective at reaching every surface, and that it is easy to operate for extended periods of time. It features a rubber handle for comfort and to provide a stable grip though usage. This supremely high quality, professional pneumatic tool will take 23 Gauge Brads in lengths of 12, 15, 18, 22, 25, 30 and 35mm.
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