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Help with Playhouse Plans

So, I found this great plan for a playhouse that I want to build for my daughter. I like the size, not too big, not too small. Too bad the original is metric.


The supply list is as follows:

bullet1 1/2"x 5 1/2" stock for floor joists. 60ft of
bullet3/4"x 3 1/2" stock for decking. 165ft of
bullet1 1/2"x 2 1/2" stock for framing. 365ft of
bullet1 1/2"x 2 1/2" treated stock for posts. 14ft of
bullet1 1/2"x 3 1/2" stock for ridge beam. 8ft of
bullet1 1/2"x 3 1/2" treated stock for handrail. 20ft of
bullet1x6 treated stock for handrail. 65ft of
bullet1x4 stock for fascia, barge board, ridge capping and door backing. 60ft of
bulletGalvanized horizontal weather strip flashing. 8ft of
bullet1/8" thick acrylic sheet (plastic glass) for windows. 16 sq ft of
bulletAssorted nails, mastic sealant, hinges, door handle, misc


 What would the difference between something like, 1 1/2"x 2 1/2" stock and 1 1/2"x 2 1/2" treated stock be?

(original link)

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Posted 2011-12-19T20:26:47+0000  by beardsworthy beardsworthy

Dimensionally, nothing. They are both 2x3's. The difference between the two of them is treated means pressure treated. The treatment is to stop, or at least slow down decay from termites, insects and fungus. Basically, the wood is put into a vacuum chamber and the preservative is forced into the wood. The two predominent treatments are alkaline copper quat (ACQ types B and D) and copper azole (CBA-A, CA-B). They come in varying degrees of strength, so make sure that you get ground contact rated PT wood if it is going to be in contact with the ground. While arsenic is no longer used in PT wood, care should still be taken in the handling of the wood while building (gloves, dust masks, etc). It would also be a good idea to seal the PT wood with an oil-based sealer/stain. That will help minimize expsosure after the playhouse is built. From what I gather looking at your materials list, the parts likely to come in contact with little hands are untreated wood. You'll notice in the picture that the railing is not painted, that's because they've used PT wood for it. On the other hand, you'll notice parts like the fascia are painted. That's untreated wood and needs the protection of that coat of exterior paint or stain.


As for the fasteners, anything going into that PT wood should be stainless steel or hot-dipped galvanized (HDG). The two treatments listed above are very corrosive to metals.


One thing to keep in mind, the dimensions for the lumber they're giving you are finished pieces. You're going to be buying based on the nominal size:

NominalActualActual - Metric
1" x 2"3/4" x 1-1/2"19 x 38 mm
1" x 3"3/4" x 2-1/2"19 x 64 mm
1" x 4"3/4" x 3-1/2"19 x 89 mm
1" x 5"3/4" x 4-1/2"19 x 114 mm
1" x 6"3/4" x 5-1/2"19 x 140 mm
1" x 7"3/4" x 6-1/4"19 x 159 mm
1" x 8"3/4" x 7-1/4"19 x 184 mm
1" x 10"3/4" x 9-1/4"19 x 235 mm
1" x 12"3/4" x 11-1/4"19 x 286 mm
1-1/4" x 4"1" x 3-1/2"25 x 89 mm
1-1/4" x 6"1" x 5-1/2"25 x 140 mm
1-1/4" x 8"1" x 7-1/4"25 x 184 mm
1-1/4" x 10"1" x 9-1/4"25 x 235 mm
1-1/4" x 12"1" x 11-1/4"25 x 286 mm
1-1/2" x 4"1-1/4" x 3-1/2"32 x 89 mm
1-1/2" x 6"1-1/4" x 5-1/2"32 x 140 mm
1-1/2" x 8"1-1/4" x 7-1/4"32 x 184 mm
1-1/2" x 10"1-1/4" x 9-1/4"32 x 235 mm
1-1/2" x 12"1-1/4" x 11-1/4"32 x 286 mm
2" x 4"1-1/2" x 3-1/2"38 x 89 mm
2" x 6"1-1/2" x 5-1/2"38 x 140 mm
2" x 8"1-1/2" x 7-1/4"38 x 184 mm
2" x 10"1-1/2" x 9-1/4"38 x 235 mm
2" x 12"1-1/2" x 11-1/4"38 x 286 mm
3" x 6"2-1/2" x 5-1/2"64 x 140 mm
4" x 4"3-1/2" x 3-1/2"89 x 89 mm
4" x 6"3-1/2" x 5-1/2"89 x 140 mm

Posted 2011-12-20T02:47:11+0000  by Paul

Welcome to the community.


 Another option would be to use cedar or redwood lumber instead of PT.


Cedar and redwood naturally resist insects rot and decay and it would be my first choice for this type of project.


You haven’t specified your location but something else to consider is to beef up on the roof rafters, coming from Australia I don’t think these plans are designed with the snow load in mind.


Posted 2011-12-20T18:52:39+0000  by George_HD_CHI
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