Online-only Table 2 Uncertainty according to the reliability of the data sources used for quantification of building materials (definitions adapted from Weidema and Wesnaes, 1996).
Pedigree matrix indicator scores | Reliability indicator pedigree matrix definition | Definition adapted to material quantification process | Data sources used to quantify materials in the database | ||
|---|---|---|---|---|---|
In newly proposed SFDs and laneway suites | In renovated buildings | In mid to high-rise buildings | |||
1 | Verified data based on measurements | Material quantification based on measurements performed on site, reflecting as-built conditions | N/A | N/A | N/A |
2 | Verified data based on measurements | Material quantification based on building drawings and details (e.g. specifications, notes, legends) | From building drawings: Majority of the building materials (e.g. used for the slabs-on-grade, foundations, sub-grade enclosures, floor construction, exterior walls, and interior partitions) | From details: Additional materials used for renovation, such as lumber, plywood, gypsum board, vapor barrier and insulation for framing the additional building floors, and concrete and steel for the slabs and foundation walls of the additional walkout and carport | From building drawings: Concrete material quantities By scaling from building drawings: Details such as heights and thicknesses of footing columns, underground columns, slabs, exterior walls, and interior walls, that were not mentioned explicitly in the notes and specifications |
3 | Verified data partly based on assumptions or non-verified data based on measurements | Material quantification based on trusted references for information not included in the building drawings (e.g. local and/or national building codes, brochures, literature) | From OBC: Thickness of the structural slabs-on-grade, size and spacing of rebars for structural slabs-on-grade, area density of mesh to structurally support stucco cladding, and cross-section of lumber used for roof construction in newly proposed SFDs | From NBC: Most of the materials that constitute the original buildings before renovation (e.g. concrete and vapor barrier for the concrete slab; vapor barrier, wood framing, and drywall for the basement; and brick veneer cladding).. | From brochures and manufacturer catalogues: Thicknesses of slabs for composite steel deck slabs39 and deep caissons or founding elevations of deep footings40. Steel structural framing for floor and decks41, mass of steel for the decks42, linear density of steel joists43, and steel cross-section44,45. From quantity takeoff software: Concrete for stairs in high-rise buildings |
4 | Non-verified data partly based on qualified estimates | Material quantification based on consultation with industry experts and estimators for information not included in the building drawings | N/A | N/A | Calculation of steel rebars in each structural concrete member were based on the rule of thumb ratios obtained from consultation with Canadian estimators and structural engineers |
5 | Qualified estimates (e.g. by industrial party) | Material quantification based on proxy data for information not included in the building drawings | From other similar buildings: Lumber for architectural posts for six buildings, rubber roof membrane for two buildings, and joists for two SFDs Wire mesh reinforcements in basement slabs for three buildings, resilient channel soundproofing in garage walls and ceilings for two buildings, TJI joist dimensions and linear densities for one building, polyurethane foam thickness for one building, wood furring on exterior walls for one building, roof membrane for one building, interior door thickness for one building, dimple membrane and rigid insulation for foundation wall of one building in the laneway suites category. | From OBC: Lumber and gypsum board used for exterior walls and interior partitions, and lumber used for roof structural frame during renovation. | N/A |
6 | Non-qualified estimate | N/A | N/A | N/A | N/A |
