Definitions & Terminology - Eaves are BASIX calculations

What is BASIX What is BASIX ? BASIX is the Building Sustainability Index. It is a web-based planning tool that is designed to assess Water, Thermal Comfort and Energy performance of a new home, extension or swimming pool (over 40 000 Litres).     Who needs a BASIX Certificate? A BASIX Certificate is required on all new single dwellings, dual occupancy, villas, townhouses and multi-units in NSW. A certificate is also required for alterations and additions over $50 000  and swimming pools at or over 40 000 Litres

Types of Eaves Boxed Eaves Eaves Trimmers also called Soffit Bearers

AS 1684 Allowable Methods Soffit Bearers Minimum Sizes

Types of Eaves Open Eaves

Types of Eaves Open Slat Eaves

Types of Eaves Raked Eaves

Types of Eaves Flush Eaves

Flush Eaves Saves Cost Problems – IF Gutter Fails Scaffold Material Labour Problems – IF Gutter Fails Water Runs Down Walls Pools Formed at Footings Causing Erosion, Swelling

Eaves Width Eaves on plans are usually measured from external walls Rafter 90 x 45 Ridge 125 x 19

Overhang Plan usually from external wall

Always Confirm In This case 740mm from internal wall

Drop Off Rafter 90 x 45 Pitch 25⁰ Distance From Top Plate to Bottom of Overhang

Calculating Drop Off Rafter 90 x 45 Pitch 25⁰ STEP 1 Calculate the RISE of Hatched Triangle

Calculating Drop Off Rafter 90 x 45 Pitch 25⁰ STEP 1 Calculate the RISE of Hatched Triangle 450mm x Tan 25⁰ = 210mm

Calculating Drop Off Rafter 90 x 45 Pitch 25⁰ STEP 1 Calculate the RISE of Hatched Triangle 450mm x Tan 25⁰ = 210mm STEP 2 Add Birdsmouth 210 + 33 =

Calculating Drop Off Rafter 90 x 45 Pitch 25⁰ STEP 1 Calculate the RISE of Hatched Triangle 450mm x Tan 25⁰ = 210mm STEP 2 Add Birdsmouth 210 + 33 = 243

Remember Overhang Usually Specified From External Wall but Calculated For Back of Birdsmouth Rafter 90 x 45 Pitch 25⁰ What is the Drop Off Cavity = 40m Brick = 110m What is the Drop Off

Drop Off Rafter 90 x 45 Pitch 25⁰

Drop Off Rafter 90 x 45 Pitch 25⁰ Remember to allow for min 12mm Clearance

Its Possible to have a Varying Drop Off Rafter 90 x 45 Pitch 25⁰

Hazards Fall from Heights Contact with Live Electrical Wires Materials, Tools falling From Heights Scaffold Collapse or Toppling over Dust Complete Safe Work Method Statement

Cutting FC Sheeting Fibro Cutters Score & Snap Knife Grinder with Diamond Blade (Dust Mask Required)

Estimating Step 1- Calculate Number of Soffit Bearers 12500 / 600 = 20.83 = 21 +1 = 22 x2= 44 44 x 0.6 x 5% = 44 x 0.63 Fixing Plate 2 @ 12.5

Estimating Step 2- Calculate Fascia Length + Verge O/H = 12.5 + 2 x 0.600 = 13.7 x 2

Estimating Step 3- Calculate Barge Board Barge Run = Half Span + Eaves Width + Fascia + Gutter = 3450+600+25+200

Estimating Step 4- Soffit Lining Soffit = 2 x Length + 4 x Barge = 2 x 12500 + 4 x 4804 = 44.216 x 1.05(5% Waste) = 46.43 / 2.4(Sheet Length) = 19.34 = 20 Sheets

Estimating Step 5- Joining Mould 20 Sheets 21 Joins x 0.6 = 12.6 x 1.05 (5% Waste) = 13.23/2.4= 5.5 = 6 Lengths

Estimating Step 6- Quad 2 x Building Length + 4 x Verge length (Rafter Centreline) 2 x 12500 + 4 x 3806 = 40 224 x 1.05 (5% Waste)= 42 235