Installation Guide

1. Cut (20) twenty 2x4-12' treated boards to 11' 8-7/8". These will be the floor joists.
2. Cut (2) two 2x4-12' treated boards into 3' long blocks to secure the 4x4s where the they butt
together. Secure the blocks to the 4x4s with 16d galvanized deck nails.
Construction Details for Optional 12'x24' Floor System
6. Install 4x8 flooring over the 2x4 floor
using 8d galvanized spiral floor nails spaced
8" apart.
4. Install the floor joists cut above between the 12' joist headers. Secure with 16d galvanized
deck nails. Build (2) two floor sections measuring 12' x 12'.
5. Place a floor assembly over the 4x4s. Square floor assembly by measuring the floor diagonally
(corner to corner), then measure the opposite corners. The measurements will be equal when
the floor is square. Toenail the frame to the 4x4s to keep it from moving. Install the second
floor section.
3. Cut (2) two 2x4-12'
treated boards to a length
of 12' -0"; they will be used for the joist headers.
Layout, from left, for 16" on center joist spacing.
'X' marks where floor joist will be placed.
Foundation size is
12'-0" x 24'-0". Check local building codes
in your area, the construction may have to change.
X
X
X
X
X
X
X
X
X
X
15-1/4"
16"
16"
2x4 Blocks
4x4-12' Treated
Runner
4x8 Flooring
2x4-12' Joist Header
4x4-12' Treated
Runner
4x4 Flooring
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Material Description 12' x 24'
2x4 Treated Blocking 2 pcs. 12'
2x4 Treated Joist Headers 4 pcs. 12'
2x4 Treated Floor Joist 20 pcs. 12'
4x4 Treated Runners 8 pcs. 12'
Flooring 3/4" 9 pcs. 4x8
Galv. Spiral Floor Nails 5 lb. 8d
Galvanized Deck Nails 5 lb. 16d