How many shingles do i need for a 12×20 shed

How many shingles do i need for a 10×12 shed

How many shingles do i need for a 12×12 shed

How many shingles do i need for a 8×10 shed

How many shingles do i need for a 10×10 shed

How many shingles do i need for a 8×12 shed

How many shingles do i need for a 12×16 shed

How many studs do i need for a 10′, 12′, 14′, 16′, 20′ & 24 foot wall

Unit weight of steel bars: (8mm, 10mm, 12mm, 16mm & 20mm)