12/16/2023 0 Comments Board volume calculator![]() The GF number is the percentage of volume (floatation) to body weight. MORE ABOUT GF (GUILD FACTOR) The “Guild Factor” or “GF” is a concept recently invented by surfer/scientist Whitney Guild, it measures the ratio between a surfers body weight and the volume (in Cubic Liters) of a surfboard. If you’re surfing in poor conditions, looking for help in crowded situations, or wearing thick wetsuits, lean towards the higher end of the range that you fall into. *If you’re surfing in warm water and good waves, the lower end of the scale is recommended. 50gf (depending on age, ability and motivation) – Novice surfers, or surfers with extremely small surf, thick wetsuits or adverse conditions: RANGE FROM. – Domesticated, lower fitness, desk jobs, and Weekend Warrior surfers: RANGE FROM. – Typical fitness with average, to above average skills: RANGE FROM. – Advanced, extremely fit, high performance surfers: RANGE FROM. Next, slide the right-hand bar to the perfect volume for your new board by placing the red dot on your desired GF Ratio. Choose your body weight by sliding the lefthand bar.Ģ. This is important to remember when building a wood fence, for example, so that future shrinkage can be taken into consideration.FIND THE PERFECT VOLUME FOR YOUR NEXT BOARD!…ġ. This is due to the fact that water is used to impregnate the chemicals into the wood at the factory. It’s also great to test firewood for proper seasoning.įinally, be sure to take note that fresh, treated wood will probably have a higher moisture content (35%-75%). This is the moisture meter I use almost on a daily basis. They are great little tools and aren’t too expensive. If you want to test for moisture content before you buy, pick up a moisture meter. Other more stringent kiln-dried standards exist but KD-19 is the most common. KD-19 (Kiln Dried 19%) lumber will have an average moisture content somewhere around 15%. This means that it has to have a moisture content below 19%. Most building lumber sold at home stores is kiln dried to some extent.
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