Intermediate and attic floor with I-joists

1. Plan of the intermediate/attic I-joist floor
2. Details
3. Specification of frame elements and dry lumber for the floor at level +3,063

1. Plan of the intermediate/attic I-joist floor

Notes:
1. Carry out the floor reinforcement of I-joists according to the details shown on the drawing.
2. If the floor is made of I-joists, a balcony uses boards, not I-joists.

2. Details

Detail 1

Notes:
1. Fix the I-joist blocking to the I-joists and the top strapping board of the first-floor wall panels with nails 3 × 70 mm, 4 pcs. per bottom flange (2 pcs. into the joist and 2 pcs. into the strapping timber) and 2 pcs. into the top flange.
2. Fix the I-joist strapping beam to the support with nails 3 × 70 mm at a spacing of 150 mm, offset relative to the opposite side.

Notes:
1. Fix the I-joists to the top strapping board of the first-floor wall panels with nails 3 × 70 mm, 4 pcs. per bottom flange (per detail).

Detail 1*

Notes:
1. Fix the I-joist blocking to the I-joists and the top strapping board of the first-floor wall panels with nails 3 × 70 mm, 4 pcs. per bottom flange (2 pcs. into the joist and 2 pcs. into the strapping timber) and 2 pcs. into the top flange.
2. Fix the OSB around the floor perimeter with screws 3,5 × 41 mm at a spacing of 150 mm to the top and bottom flanges of the floor I-joists.

Detail 2

Notes:
1. Fix I-joists to other I-joists on an OBR-Z timber support 25 × 140 × 76 mm (split, left + right = 1 pcs.) with screws 3,5 × 41 mm through board inserts 37 × 147 mm.
2. Fix the board inserts 37 × 147 mm to each other with screws 6 × 80 mm, 4-6 pcs. per board.
3. Besides the timber support, fix the joist at the top flange with a structural angle 50 × 50 × 35 mm and screws 3,5 × 41 mm, 6-8 pcs. per angle.

Detail 3

Note:
Fix the I-joist blocking to the I-joists and the top strapping board of the first-floor wall panels with nails 3 × 70 mm, 4 pcs. per bottom flange (2 pcs. into the joist and 2 pcs. into the strapping timber) and 2 pcs. into the top flange.

Detail 4

Note:
Under the joints of the 22 mm OSB decking, fix board blocking 37 × 97 mm to the top flange of the I-joist with nails 3 × 70 mm (4 pcs. per block).

Detail 5

Note:
I-joists that meet other I-joists as a cantilever or on a support are fixed with structural angles 50 × 50 × 35 mm (1 angle on each flange), and on the other side of the angle with nails 3 × 70 mm, 2 pcs. per bottom flange (1 pcs. into the joist and 1 pcs. into the strapping timber) and 1 pcs. into the top flange.

Detail 6

Notes:
1. Reinforce the I-joist detail under the post with an extra board 37 × 147 mm, fixing them together with screws 6 × 120 mm, 4-6 pcs. Fix the extra boards together at the adjacent joist with screws 6 × 80.
2. Fix the detail between the flanges of the I-joists with structural angles 50 × 50 × 35 mm and screws 3,5 × 41 mm (4 pcs.).
3 In addition, fix the bottom flange with nails 3 × 70 mm to the top strapping timber of the first-floor walls (2-4 pcs.).

Detail 6*

Notes:
1. Reinforce the I-joist detail under the post with an extra board 37 × 147 mm, fixing them together with screws 6 × 120 mm, 4-6 pcs. Fix the extra boards together at the adjacent joist with screws 6 × 80 mm.
2. In addition, fix the bottom flange with nails 3 × 70 mm to the top strapping timber of the first-floor walls (2-4 pcs.).

Detail 6**

Notes:
1. Reinforce the I-joist detail under the post with an extra board 37 × 147 mm, fixing them together with screws 6 × 120 mm, 4-6 pcs. Fix the extra boards together at the adjacent joist with screws 6 × 80.
2. In addition, fix the bottom flange with nails 3 × 70 mm to the top strapping timber of the first-floor walls (2-4 pcs.).

Detail 7

Notes:
1. Reinforce the I-joist header under the post with an extra board 37 × 147 mm, fixing them together with screws 6 × 160 mm, 4-6 pcs. (100 mm spacing).
2. Fix the detail between the top flanges of the I-joist and the I-joist header with structural angles 50 × 50 × 35 mm and screws 3,5 × 41 mm (2 pcs.).
3 Fix the bottom flange with nails 3 × 70 mm to the top strapping timber of the first-floor walls (4 pcs.).

Detail 8

Notes:
1. Join the I-joists to each other along their length at a support using extra board pieces 37 × 197 mm with a 3 mm gap at each flange, with screws 6 × 80 mm, 4-6 pcs. per detail.
2. Fix the I-joists to the top strapping board of the first-floor wall panels with nails 3 × 70 mm, 4 pcs. per bottom flange (2 pcs. into the joist and 2 pcs. into the strapping timber).

Detail 8*

Notes:
1. Join the I-joists to each other along their length at a support using extra board pieces 37 × 147 mm with a 3 mm gap at each flange, with screws 6 × 160 mm, 10-12 pcs. per detail.
2. Fix the I-joists to the top strapping board of the first-floor wall panels with nails 3 × 70 mm, 4 pcs. per bottom flange.

Detail 9 (reinforcing I-joists)

Note:
Join double I-joists to each other (at a spacing of 850 mm) along their length using extra board pieces 37 × 147 mm with a 3 mm gap at each flange, with screws 6 × 160 mm, 4-8 pcs. per detail.

Detail 10

Notes:
1. Join the I-joist strapping beams to each other along their length using extra OSB pieces 12 mm with a 3 mm gap at each flange, with screws 3,8 × 41 mm, 4-6 pcs. per detail.
2. Fix the I-joist strapping beams to the support as shown in Detail 1.

Detail 11

Note:
Build the post base up from three boards 37 × 147 mm with screws 4,2 × 64 mm and fix it to the support with structural angles 105 × 105 × 90 mm and screws 3,5 × 41 mm.

Specification of frame elements and dry lumber for the floor at level +3,063

Specification of OSB for the intermediate floor

Fastener schedule for the intermediate floor