Plywood Grading - Types of plywood

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When buying plywood from your local Home Depot, Rona, Lowes or other wood supplier, you might have noticed that all the plywood is "graded". The most common plywood grading scheme is from A to D, with A being the highest quality with zero blemishes and great sanding, and D being the worst with the greatest number of blemishes (allowed).

Grading also typically comes in pairs where each grade addresses a different side or “face” of the stock piece, ie one letter will address the quality issues of the front face and the second, the side opposite to the face. So for instance, an A-C plywood sheet would be highly finished on the front face with a relatively poorer finish on the back. Similarly, construction grade C-D (referred to as CDX) plywood, is great for structural use but not for projects requiring a high quality finish.

Bonding Types

Along with the plywood grading system, plywood comes in different bonding where each type is differentiated by the glue used to bind the layers (aka plies) of plywood. We’ll cover each in turn.

Interior Plywood
This type is made for interior use only, from hardwood and softwood species and is generally used in places where exposure to moisture is minimal, e.g. furniture, wall sheathing, cabinetry, etc. Interior plywood is available in most grades and comes in a variety of hardwood species like birch, oak and cherry.

Exterior Plywood
By far, much more sturdier and moisture-resistant than interior plywood, this type can be used outdoors and is easily available from local suppliers. Like its interior counterpart, it also comes in various grades—A-C, B-C and CDX are widely available—and hardwood species.

Marine Plywood
If you’re really looking for highly moisture-resistant plywood, look no further than Marine Plywood, which is both manufactured in top quality and uses the highest adhesives. And though commonly graded A-A for two highly placed faces, hardwood choices for exterior use (where the type would be most useful) are limited.

Structural Plywood
If you’re looking for beauty over brawn, this type is ideal although it is rarely found in a grade higher than C-D and is atypically used in construction sites (as concrete forms). Special resins are used to adhere the layers together and they are designed in such a way that the plies are less likely to separate.

Plywood Sizing
Just like hardwood and softwood sizes, plywood sizes can be just as confusing if not more. Although sheets are usually sold as 4’ wide, they may sometimes be found in 2’ and 5’ widths. Similarly, just as a typical plywood sheet’s length is 8’ they can also be found in 4’ and 12’ sizes as well as metric sizes. The variety can easily confuse the best of us.

And that’s just the beginning; the variation of sizes above will be a walk in the park compared to the thickness dimensions. Common sizes on the US market are ¼”, ½” and ¾”. That said, a ¼” plywood sheet is really 7/32”; ½” a 15/32” and ¾”, a 23/32”.

And though the 1/32” doesn’t seem like much, it can make all the difference when working with plywood. Consider this: a wood craftsman is constructing a bookshelf where a ¾” shelf is inserted into a dado cut into the shelf standards; the 1/32” gap will not only be noticeable, the dado will feel sloppy and unprofessionally handled. To counteract such a situation, the dado will need to be cut at 23/32”, ensuring a snug fit.

Oneida Air Systems Dust Deputy Review

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The Marketing & PR department over at Oneida has to be pretty good one, claiming as they have that it successfully retains 99% dust, using a mini cyclone attaching onto a 5 gallon bucket lid which in turn, acts as a particle separator for a shop vac.

That’s a pretty tall order, so we investigated. The “secret” to a clean work space is keeping dust to a minimum and if you value your sanity, you’ll agree. But there doesn’t seem to be an adequate dust collector on the market emptying out the shop vac and maintaining a high suction level. But, as you may have noticed, shop vacs are noisy.

We came into the review with high hopes and expectations, judging by the stellar reviews given by other woodworking communities and haven’t been disappointed so far putting it into operation the moment we got our hands on it. After ensuring our shop vac tub and filter were as clean as possible, we took a look at the filter after use and were amazed to see only a light coat of dust inside. This came after using Dust Deputy for a week AND emptying out the 5 gallon bucket five times, making this appliance a godsend.

We individually bought the cyclone from Rockler for $60 plus shipping, and because we had the extra hoses and shop vac attachments, didn’t require the full kit. However, if you don’t have the hoses and attachments we would recommend purchasing the full kit at $100.

 
Having attached the cyclone the bucket’s lit, we cut a ½” plywood piece to the inside of the lid to serve as reinforcement. Filling the 5 gallon bucket to about 1/3 of its volume with 16 penny framing nails, and inserting the Dust Deputy bucket inside the bucket of nails ensures that it won’t fall over. However, we would recommend constructing a cart to hold the two as a long term measure.

Though the price of the Dust Deputy is a bit on the higher side, it will also save you time and money spent cleaning out your shop vac filter. Furthermore, there is no drop in suction power with a hose’s extended length. We give it a 4 out of 5 stars for its perfect performance and highly recommend that you add it to your shop environment.

Makita 5094DWD 14.4v Cordless 3 3/8

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You might not think you need the Makita 5094DWD 14.4v Cordless Circular Trim Saw Kit , until you own one and then life is not the same without it.

The first thing you notice about the saw is how small it is; not so much as a unit, but in terms of its blade size which clocks in at 3 3/8”. And while it isn’t going to be cutting through large stocks any time soon, this is a great little tool for cutting thinner pieces of stock. Clocking in at 4.6lbs and total length 12 5/8”, both including battery dimensions, the saw can be used for long periods of time without user fatigue setting in. The overall feel from front to back, is also incredibly well balanced for a saw of this size.

Powered by a 14.4v 2.6A NiMH single battery, the kit includes a multi-voltage charger kit and one 1.2A battery. The charger itself can handle both Makita pod-style NiCad and NiMh batteries ranging from 7.2v to 14.4v; the charging times themselves can vary based on voltage and capacity but on average, it takes an empty battery roughly 90 minutes to recharge.

Lumber Wizard Metal Detector Review

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Metal detectors are of particular importance to woodworkers; how many times have you heard horror stories of expensive saw and planer blades being rendered useless by a stray piece of metal lodged deep in a piece of stock that wasn’t identified until it was too late?

Reviewing the Lumber Wizard , we would like to mention that we owned a downgraded version of this model and the only reason we upgraded was the 2” limit. The Little Wizard allows detection for up to 2” of wood so anything beyond that doesn’t register and needless to say we needed the large scanning field.

Now, the Lumber Wizard is just a fancy name for your regular metal detector in terms of core functionality and is priced at a reasonable $99.95 but is worth the investment in terms of the money and time you’re saving replacing other blades. There have been a few revisions to the core functionality; the latest model is the Lumber Wizard III but at its core this review covers all the basics.