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Definitions & Terminology
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Definitions & Terminology
- Eaves are BASIX calculations
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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
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Types of EavesBoxed Eaves
Eaves Trimmers also called Soffit Bearers
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AS 1684 Allowable Methods
Soffit Bearers Minimum Sizes
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Types of EavesOpen Eaves
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Types of EavesOpen Slat Eaves
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Types of EavesRaked Eaves
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Types of EavesFlush Eaves
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Flush Eaves
• Saves Cost– Scaffold– Material– Labour
• Problems – IF Gutter Fails– Water Runs Down Walls– Pools Formed at Footings– Causing Erosion, Swelling
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Rafter 90 x 45Ridge 125 x 19
Eaves Width
1. Eaves on plans are usually measured from external walls
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OverhangPlan usually from external wall
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Always Confirm
In This case 740mm from internal wall
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Rafter 90 x 45Pitch 25⁰
Drop OffDistance From Top Plate to Bottom of Overhang
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Rafter 90 x 45Pitch 25⁰
Calculating Drop OffSTEP 1 Calculate the RISE of Hatched Triangle
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Rafter 90 x 45Pitch 25⁰
Calculating Drop OffSTEP 1 Calculate the RISE of Hatched Triangle
450mm x Tan 25⁰ = 210mm
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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 =
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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
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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
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Rafter 90 x 45Pitch 25⁰
Drop Off
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Rafter 90 x 45Pitch 25⁰
Drop Off
Remember to allow for min 12mm Clearance
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Rafter 90 x 45Pitch 25⁰
Its Possible to have a Varying Drop Off
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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
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Cutting FC Sheeting
• Fibro Cutters• Score & Snap Knife• Grinder with Diamond Blade (Dust Mask
Required)
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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
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No. LengthSoffit Bearers 70 x 35 F5 44 0.630 27.720 27.900 1.90$ 53.01$
Wall Plate 70 x 35 F5 2 12.500 12.600 25.200 1.90$ 47.88$
Cost Order
Item Section Size Material Linear Total Linear Rate / lm
Note – In this case as waste has been added already we don’t take the individual bearers up to the next 300mm as there will be to much waste.
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Estimating
Step 2- Calculate Fascia
Length + Verge O/H = (12.5 + 2 x 0.600) x 1.05 = 14.4 x 2
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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 14.400 14.400 28.800 7.00$ 201.60$
Cost Order
Item Section Size Material Linear Total Linear Rate / lm
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Estimating
Step 3- Calculate Barge Board
Barge Run = Half Span + Eaves Width + Fascia + Gutter+ Plumb Cut + Waste
= (3450+600+25+200+tan 25 x190) x 1.05
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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 5.046 5.100 20.400 7.00$ 142.80$
Cost Order
Item Section Size Material Linear Total Linear Rate / lm
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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
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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
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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
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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
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Estimating
Step 6- Quad
2 x Building Length + 4 x Verge length (Rafter Centreline) + 8 x Quad (Mitred)
2 x 12500 + 4 x 3806 + 8 x 19 = 40 376 x 1.05 (5% Waste)= 42 395
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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 42.395 42.600 42.600 1.17$ 49.84$
Total 631.76$
Cost Order
Item Section Size Material Linear Total Linear Rate / lm