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What’s the Difference between SPF and SPFs lumber?
A:SPF is short for Spruce-Pine-Fir, a grouping of various commercially important species. SPFs is also Spruce-Pine-Fir, but the lower case “s” indicates that the lumber was produced from logs harvested in the USA, south of the Canadian border. Lumber without the lower case “s” indi- cates that the log source was exclusively Canadian in origin. The “s” designation became necessary to distinguish the two species groupings as a result of separate testing by the U.S. and Canada.
Are block walls built with surface-bonding cement as strong as walls built with mortar?
A:Concrete-block walls coated with surface- bonding cement are stronger than walls built the traditional way. Surface-bonding cement is sold in bags containing fiber-reinforcement, cement, sand and polymers. The surface-bonded wall must rest on a solid concrete foundation. Also, check with your local building department about require- ments for internal reinforcement. If it’s required by code, you may need to fill the block cores with an approved grout. After you’ve stacked and capped the wall, dampen the surface with water and use a trowel to apply the surface-bonding cement as thick as the manufacturer recommends.
What is the best type of rock to line a French drain?
A:Your landscape supply store will likely have a few varieties of stone sold as “drainage rock,” but some of these selections are decorative in nature and more expensive than what you’ll need for a buried trench. For the best drainage,
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