Definitions & Terminology - Eaves are BASIX calculations.
Jan 03, 2016
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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 EavesBoxed Eaves
Eaves Trimmers also called Soffit Bearers
AS 1684 Allowable Methods
Soffit Bearers Minimum Sizes
Types of EavesOpen Eaves
Types of EavesOpen Slat Eaves
Types of EavesRaked Eaves
Types of EavesFlush Eaves
Flush Eaves
• Saves Cost– Scaffold– Material– Labour
• Problems – IF Gutter Fails– Water Runs Down Walls– Pools Formed at Footings– Causing Erosion, Swelling
Rafter 90 x 45Ridge 125 x 19
Eaves Width
1. Eaves on plans are usually measured from external walls
OverhangPlan usually from external wall
Always Confirm
In This case 740mm from internal wall
Rafter 90 x 45Pitch 25⁰
Drop OffDistance From Top Plate to Bottom of Overhang
Rafter 90 x 45Pitch 25⁰
Calculating Drop OffSTEP 1 Calculate the RISE of Hatched Triangle
Rafter 90 x 45Pitch 25⁰
Calculating Drop OffSTEP 1 Calculate the RISE of Hatched Triangle
450mm x Tan 25⁰ = 210mm
Rafter 90 x 45Pitch 25⁰
Calculating Drop OffSTEP 1 Calculate the RISE of Hatched Triangle450mm x Tan 25⁰ = 210mm
STEP 2 Add Birdsmouth
210 + 33 =
Rafter 90 x 45Pitch 25⁰
Calculating Drop OffSTEP 1 Calculate the RISE of Hatched Triangle450mm x Tan 25⁰ = 210mm
STEP 2 Add Birdsmouth
210 + 33 = 243
Rafter 90 x 45Pitch 25⁰
Remember Overhang Usually Specified From External Wall but Calculated For
Back of Birdsmouth
What is the Drop OffCavity = 40mBrick = 110mWhat is the Drop Off
Rafter 90 x 45Pitch 25⁰
Drop Off
Rafter 90 x 45Pitch 25⁰
Drop Off
Remember to allow for min 12mm Clearance
Rafter 90 x 45Pitch 25⁰
Its Possible to have a Varying Drop Off
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
No. LengthSoffit Bearers 70 x 35 F5 44 0.630 0.900 39.600 1.90$ 75.24$
Wall Plate 70 x 35 F5 2 12.500 12.600 25.200 1.90$ 47.88$
Item Section Size Material Linear Total Linear Rate / lm Cost Order
Estimating
Step 2- Calculate Fascia
Length + Verge O/H = 12.5 + 2 x 0.600 = 13.7 x 2
No. LengthSoffit Bearers 70 x 35 F5 44 0.630 0.900 39.600 1.90$ 75.24$
Wall Plate 70 x 35 F5 2 12.500 12.600 25.200 1.90$ 47.88$ Fascia 190 x 25 H3 FJ 2 13.700 13.800 27.600 7.00$ 193.20$
Item Section Size Material Linear Total Linear Rate / lm Cost Order
Estimating
Step 3- Calculate Barge Board
Barge Run = Half Span + Eaves Width + Fascia + Gutter
= 3450+600+25+200
No. LengthSoffit Bearers 70 x 35 F5 44 0.630 0.900 39.600 1.90$ 75.24$
Wall Plate 70 x 35 F5 2 12.500 12.600 25.200 1.90$ 47.88$ Fascia 190 x 25 H3 FJ 2 13.700 13.800 27.600 7.00$ 193.20$
Barge Board 190 x 25 H3 FJ 4 4.806 5.100 20.400 7.00$ 142.80$
Cost Order
Item Section Size Material Linear Total Linear Rate / lm
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
No. LengthSoffit Bearers 70 x 35 F5 44 0.630 0.900 39.600 1.90$ 75.24$
Wall Plate 70 x 35 F5 2 12.500 12.600 25.200 1.90$ 47.88$ Fascia 190 x 25 H3 FJ 2 13.700 13.800 27.600 7.00$ 193.20$
Barge Board 190 x 25 H3 FJ 4 4.806 5.100 20.400 7.00$ 142.80$ Soffit Lining 600 FC 20 2.4 x 0.6 5.00$ 100.00$
Cost Order
Item Section Size Material Linear Total Linear Rate / lm
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
No. LengthSoffit Bearers 70 x 35 F5 44 0.630 0.900 39.600 1.90$ 75.24$
Wall Plate 70 x 35 F5 2 12.500 12.600 25.200 1.90$ 47.88$ Fascia 190 x 25 H3 FJ 2 13.700 13.800 27.600 7.00$ 193.20$
Barge Board 190 x 25 H3 FJ 4 4.806 5.100 20.400 7.00$ 142.80$ Soffit Lining 600 FC 20 2.4 x 0.6 5.00$ 100.00$ Joining Strip H Mould 6 2.400 2.400 14.400 1.58$ 22.80$
Cost Order
Item Section Size Material Linear Total Linear Rate / lm
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
No. LengthSoffit Bearers 70 x 35 F5 44 0.630 0.900 39.600 1.90$ 75.24$
Wall Plate 70 x 35 F5 2 12.500 12.600 25.200 1.90$ 47.88$ Fascia 190 x 25 H3 FJ 2 13.700 13.800 27.600 7.00$ 193.20$
Barge Board 190 x 25 H3 FJ 4 4.806 5.100 20.400 7.00$ 142.80$ Soffit Lining 600 FC 20 2.4 x 0.6 5.00$ 100.00$ Joining Strip H Mould 6 2.400 2.400 14.400 1.58$ 22.80$
Quad 19 x 19 H3 FJ 1 42.235 42.300 42.300 1.17$ 49.49$
Total 631.41$
Cost Order
Item Section Size Material Linear Total Linear Rate / lm
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