If what you're looking for is longevity, composite decking and railings may be something you want to consider. If your playhouse has lumber protected by a roof and plywood walls, normal KD is recommend in order to further save. It is perfectly safe for children to interact with, and when compared to cedar, red wood, composite or other types of soft and hardwoods, PT lumber is the most rigid and weather resistant material for the dollar. If cost is your biggest concern, and the design you chose does not have a roof covering some of the structure, pressure treated lumber is recommend. What lumber should I use to build my playhouse? Be sure to use galvanized, stainless or coated fasteners when constructing with PT lumber. While this process is safe for humans to touch and interact with, it does have very corrosive properties when in contact with metallic building materials, such as nails, screws, bolts and joist hangers. This technique allows the wood (typically Pine) to withstand moisture, fungus and ground contact for many years. In order to closely replicate the protective abilities of arsenic, tremendous levels of copper are instead infused into today's PT lumber. While CCA is still sold for very specific applications, all the lumber you'll find in hardware stores and residential lumber yards use the ACQ or similar treatment. Although ACQ's preservative properties can't quite match CCA's, the substantial risk reduction of toxin exposure was worth the switch. The solution was ACQ (Alkaline Copper Quaternary) treated lumber. Where is PT lumber today? Toward the end of 2003, the United States' Environmental Protection Agency and the pressure treated wood industry as a whole mutually decided the move away from arsenic based formulas and toward something safer for children and adults. The concern didn't really begin until the 1970s where homeowners began incorporating arsenic based treatments into outdoor decks, planters and play-sets, as this was cheaper than using naturally more weather resilient material. Arsenic is a Group-A carcinogen and well known toxin that causes adverse short and long term problems, including heart disease, diabetes and cancer.ĬCA's primary uses were typically industrial and utilitarian applications, with the concerns of long term exposure, especially to children, taking a back seat to maximum longevity. Most formulas infused the wood grain with chromated copper arsenate (CCA), a powerful preservative that contains arsenic. History of pressure treat lumber Modern day lumber chemical treatments first began in the late 19th century to help preserve railroad cross-ties withstand all weather conditions and direct ground contact. Is the concern over pressure treated lumber really warranted? Not everyone has the budget to double their material cost to just play it safe and potentially lower an undefined and uncertain risk. In fact, some of the parents believed it was so unsafe, they literally spent thousands of dollars more to upgrade all the decking, ladders and railings to cedar, red wood or something else non-treated. Over the years that I have been building children's tree houses and play structures, I've been asked several times by concerned parents if it's healthy for youngsters to play and directly interact with pressure treated lumber. Should You Use PT Lumber On Your Child's Playhouse?
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