Sample Tea Houses

扶桑庵 八窓庵 gogoan
三分庵 jikishian

How to Use this Web Page

  1. Drawings are in presumed build order. 
  2. All measurements and build activities must be made from the corner marked ANCHOR on each drawing.
  3. Measurements are in actual sanded and dried dimensions not rough sawn dimensions.
  4. Exterior sides are marked as A, B, C, and D. 
  5. Download the printable PDF version of each drawing by clicking on the drawing displayed on this web page.  Downloading the PDF file can take a rather long time.  However,  the PDF version can be scaled and printed on a large format printer. 
  6. This design assumes that the existing trailer has an 8' x 11' deck made of 3/4" preasure treated plywood. 
  7. All exposed wood will be hinoki wood. 
  8. All flooring and interior detail wood other than the interior post which frames the picture alcove should be B Select lumber or better. 
  9. While the footer beams can be bolted to the deck,  there will be no exposed bolts or nails used to secure the corner posts to the beams. 
  10. Posts, beams, and door frames on sides B and D will overhang the deck by 1/4". 
  11. Outer wall surface will be inset 1/4" from the edge of the footer beam.  This means that the outer wall surface will come to the edge of the trailer deck. 
  12. Framing for all windows and the crawling entrance (side A) will be flush with the outer wall surface. 
  13. The roof will be covered with white cedar shakes or shingles.  Shingles are sawn.  Shakes are split.  Shingles have a relatively smooth surface while shakes have at least one highly textured natural grain split surface. 
  14. The roof will have a water management layer such as Tyvec or #15 building paper between the plywood and the shingles. 
  15. Walls will be clad in Tyvec Stucco Wrap or equivalent. 
  16. Click here to go to the general project planning page. 

Construction Drawings




Dexter #32256
Order #139669-8

ItemMfgPartSpect
Hub-Drum KitDexter Axle008-247-055 on 4.50 BC
LH BrakeDexter AxleK23-026-005 on 4.50 BC
RH BrakeDexter AxleK23-027-005 on 4.50 BC


Elevation of Floor above
Ground Level
ChashitsuPlatecminin
Yuin5150.019 3/421 3/4
unnamed6048.51921
Fushin-an6746.918 1/220 1/4
unnamed7545.51819 3/4
unnamed8247.018 1/220 1/4
unnamed8947.018 1/220 1/4
unnamed12147.918 3/420 3/4

Estimated Elevation of Floor above Ground Level
Maximum
20 - 3 1/2 = 16 1/2 + 4 = 20 1/2 inches
Minimum
20 - 7     = 13     + 4 = 17     inches





The house frame is attached to the trailer frame by stainless steel carriage bolts secured by Flexloc self-locking nuts.  These nuts can only be used once and must be discarded if removed. During early asembly stages,  use ordinary nuts to temporarily secure parts.  Washers will be used to distribute forces over a greater surface area. 



Exterior End Posts

Note 1It should be possible to lay secondary ridge beams to either side of the primary ridge beam.  These would have to be 1 1/4 x 4 stock milled to approximately 3 x 1.


























Interior Plywood

"Medium Density Overlay (MDO) is regular plywood core with a smooth 10 mill paper applied to one or both faces.  The smooth paper facing is an excellent surface for painting signs.  If sealed and primed properly MDO can be used outside.  Thicknesses available in 3/8",  ½",  ¾"  GIS an G2S.  4x8 sheets.  Paper faced plywood can accept paint very well and will look alot like drywall.  I guess you could even tape and mud the seams like drywall." 


New Castle Climate


Insulating the Tea Hut
Insulation locationR-ValueNotes
Attic49.0
Wall Sheathing5.0It is important to make sure both the insulative sheathing and cavity insulation recommended.  Insulative sheathing may be placed outside of wood sheathing product,  or special braces can be used. 
Floor25.0Over unheated, uninsulated space. 
A good rule-of-thumb:  to prevent trapping any moisture in a cavity,  the cold-side material's perm rating should be at least five times greater than the value of the warm-side. l Use a vapor diffusion retarder with a perm value of less than 0.50 if you also have a high water table.  (DOE)

Metrics

The following unit conversion information is pertinent to the subject of VDRs:

BASIC METRIC CONVERSIONS TO GET MULTIPLY BY
Permeance at 73.4°F [23°C] ng/m2.s.Pa grain/ft2.h.1in.Hg 57.2148
Thermal Resistance ® [RSI] RSI R 0.1761
Thermal Conductance (U) [k] W/m2.°C Btu.ft2.h.°F 5.6783
Vapor Transmission Rate (WVTR) at 73.4°F [23°C]
and 50% RH		 G/m2.d
(WVT=permeance x vapor pressure differential at specific temperature and RH)		 grain/ft2.d 0.6975