/**
* Roofing Industry Constants
* Pitch multipliers, material specifications, and coverage calculations
*/
import type { MaterialSpecification, RoofMaterialType } from '../types/calculations.types.js';
// ============================================================================
// Pitch Multipliers (Industry Standard)
// ============================================================================
/**
* Pitch multiplier lookup table
* Used to adjust flat area to actual sloped roof area
* Source: National Roofing Contractors Association (NRCA)
*/
export const PITCH_MULTIPLIERS: Record<string, number> = {
'flat': 1.000,
'0/12': 1.000,
'1/12': 1.003,
'2/12': 1.014,
'3/12': 1.031,
'4/12': 1.054,
'5/12': 1.083,
'6/12': 1.118,
'7/12': 1.158,
'8/12': 1.202,
'9/12': 1.250,
'10/12': 1.302,
'11/12': 1.357,
'12/12': 1.414,
'13/12': 1.474,
'14/12': 1.537,
'15/12': 1.601,
'16/12': 1.667,
'17/12': 1.734,
'18/12': 1.803,
};
/**
* Helper function to get pitch multiplier
* Handles various input formats
*/
export function getPitchMultiplier(pitch: string): number {
// Normalize pitch string
const normalized = pitch.toLowerCase().trim().replace(/\s+/g, '');
// Direct lookup
if (PITCH_MULTIPLIERS[normalized]) {
return PITCH_MULTIPLIERS[normalized];
}
// Try parsing as "X/12" or "X:12"
const match = normalized.match(/^(\d+)(?:[/:])12$/);
if (match) {
const key = `${match[1]}/12`;
return PITCH_MULTIPLIERS[key] || 1.000;
}
// Default to flat
console.warn(`Unknown pitch format: ${pitch}, defaulting to flat (1.000)`);
return 1.000;
}
// ============================================================================
// Roofing Material Specifications
// ============================================================================
export const ROOFING_MATERIAL_SPECS: Record<RoofMaterialType, MaterialSpecification> = {
'architectural_shingles': {
sku: 'SHNG-ARCH-001',
name: 'Architectural Shingles - Premium Grade',
material_type: 'architectural_shingles',
coverage_per_unit: 33.33, // sq ft per bundle (100 sqft / 3 bundles)
uom: 'bundle',
weight_per_unit: 78, // lbs per bundle
dimensions: {
length: 36,
width: 13,
unit: 'inches'
},
typical_unit_cost: 95.00,
typical_unit_price: 142.50,
warranty_years: 30
},
'3tab_shingles': {
sku: 'SHNG-3TAB-001',
name: '3-Tab Shingles - Standard Grade',
material_type: '3tab_shingles',
coverage_per_unit: 33.33,
uom: 'bundle',
weight_per_unit: 60,
dimensions: {
length: 36,
width: 12,
unit: 'inches'
},
typical_unit_cost: 65.00,
typical_unit_price: 97.50,
warranty_years: 20
},
'metal_standing_seam': {
sku: 'MTL-SS-001',
name: 'Metal Standing Seam - Aluminum',
material_type: 'metal_standing_seam',
coverage_per_unit: 100, // sq ft per panel
uom: 'sheet',
weight_per_unit: 45,
dimensions: {
width: 16,
unit: 'inches'
},
typical_unit_cost: 425.00,
typical_unit_price: 637.50,
warranty_years: 50
},
'metal_corrugated': {
sku: 'MTL-CORR-001',
name: 'Corrugated Metal Panel - Galvalume',
material_type: 'metal_corrugated',
coverage_per_unit: 100,
uom: 'sheet',
weight_per_unit: 38,
dimensions: {
width: 26,
unit: 'inches'
},
typical_unit_cost: 185.00,
typical_unit_price: 277.50,
warranty_years: 40
},
'tile_concrete': {
sku: 'TILE-CONC-001',
name: 'Concrete Tile - Standard Profile',
material_type: 'tile_concrete',
coverage_per_unit: 1.0, // sq ft per tile
uom: 'piece',
weight_per_unit: 10,
dimensions: {
length: 16,
width: 12,
unit: 'inches'
},
typical_unit_cost: 3.50,
typical_unit_price: 5.25,
warranty_years: 50
},
'tile_clay': {
sku: 'TILE-CLAY-001',
name: 'Clay Tile - Mediterranean Style',
material_type: 'tile_clay',
coverage_per_unit: 1.0,
uom: 'piece',
weight_per_unit: 12,
dimensions: {
length: 16,
width: 10,
unit: 'inches'
},
typical_unit_cost: 5.00,
typical_unit_price: 7.50,
warranty_years: 100
},
'slate': {
sku: 'SLATE-NAT-001',
name: 'Natural Slate - Premium',
material_type: 'slate',
coverage_per_unit: 1.0,
uom: 'piece',
weight_per_unit: 15,
dimensions: {
length: 24,
width: 12,
unit: 'inches'
},
typical_unit_cost: 12.00,
typical_unit_price: 18.00,
warranty_years: 100
},
'flat_membrane_tpo': {
sku: 'FLAT-TPO-001',
name: 'TPO Membrane - 60 mil White',
material_type: 'flat_membrane_tpo',
coverage_per_unit: 100, // sq ft per roll
uom: 'roll',
weight_per_unit: 75,
dimensions: {
width: 10,
length: 10,
unit: 'feet'
},
typical_unit_cost: 180.00,
typical_unit_price: 270.00,
warranty_years: 20
},
'flat_membrane_epdm': {
sku: 'FLAT-EPDM-001',
name: 'EPDM Membrane - 60 mil Black',
material_type: 'flat_membrane_epdm',
coverage_per_unit: 100,
uom: 'roll',
weight_per_unit: 80,
dimensions: {
width: 10,
length: 10,
unit: 'feet'
},
typical_unit_cost: 150.00,
typical_unit_price: 225.00,
warranty_years: 25
}
};
// ============================================================================
// Accessory Material Specifications
// ============================================================================
export const ROOFING_ACCESSORIES: Record<string, MaterialSpecification> = {
'underlayment_felt_15lb': {
sku: 'UND-FELT-15',
name: '15lb Felt Underlayment',
material_type: 'underlayment',
coverage_per_unit: 400, // sq ft per roll (4' x 100')
uom: 'roll',
weight_per_unit: 60,
dimensions: {
width: 4,
length: 100,
unit: 'feet'
},
typical_unit_cost: 45.00,
typical_unit_price: 67.50
},
'underlayment_synthetic': {
sku: 'UND-SYNTH-001',
name: 'Synthetic Underlayment',
material_type: 'underlayment',
coverage_per_unit: 1000, // sq ft per roll (4' x 250')
uom: 'roll',
weight_per_unit: 55,
dimensions: {
width: 4,
length: 250,
unit: 'feet'
},
typical_unit_cost: 120.00,
typical_unit_price: 180.00
},
'ice_and_water_shield': {
sku: 'ICE-WATER-001',
name: 'Ice & Water Shield',
material_type: 'ice_and_water',
coverage_per_unit: 200, // sq ft per roll (2' x 100')
uom: 'roll',
weight_per_unit: 75,
dimensions: {
width: 2,
length: 100,
unit: 'feet'
},
typical_unit_cost: 125.00,
typical_unit_price: 187.50
},
'drip_edge_aluminum': {
sku: 'DRIP-ALU-001',
name: 'Aluminum Drip Edge - 2"',
material_type: 'drip_edge',
coverage_per_unit: 10, // linear feet per piece
uom: 'piece',
weight_per_unit: 1.5,
dimensions: {
length: 10,
unit: 'feet'
},
typical_unit_cost: 8.50,
typical_unit_price: 12.75
},
'ridge_cap_shingles': {
sku: 'RIDGE-CAP-001',
name: 'Ridge Cap Shingles',
material_type: 'ridge_cap',
coverage_per_unit: 20, // linear feet per bundle
uom: 'bundle',
weight_per_unit: 25,
typical_unit_cost: 55.00,
typical_unit_price: 82.50
},
'starter_strip': {
sku: 'START-STRIP-001',
name: 'Starter Strip Shingles',
material_type: 'starter',
coverage_per_unit: 100, // linear feet per roll
uom: 'roll',
weight_per_unit: 35,
typical_unit_cost: 65.00,
typical_unit_price: 97.50
},
'valley_flashing': {
sku: 'VALLEY-FLASH-001',
name: 'Valley Flashing - 24" Aluminum',
material_type: 'valley_flashing',
coverage_per_unit: 50, // linear feet per roll
uom: 'roll',
weight_per_unit: 20,
dimensions: {
width: 24,
length: 50,
unit: 'feet'
},
typical_unit_cost: 85.00,
typical_unit_price: 127.50
},
'roofing_nails_coil': {
sku: 'NAIL-COIL-001',
name: 'Coil Roofing Nails - 1.25"',
material_type: 'nails',
coverage_per_unit: 7200, // nails per box (120 nails per pound, 60 lbs per box)
uom: 'box',
weight_per_unit: 60,
typical_unit_cost: 95.00,
typical_unit_price: 142.50
},
'pipe_boot': {
sku: 'BOOT-PIPE-001',
name: 'Rubber Pipe Boot - Standard',
material_type: 'penetration',
coverage_per_unit: 1,
uom: 'piece',
weight_per_unit: 2,
typical_unit_cost: 12.00,
typical_unit_price: 18.00
}
};
// ============================================================================
// Calculation Helpers
// ============================================================================
/**
* Calculate bundles needed for shingles
* @param squares Total roofing squares (including waste)
* @returns Number of bundles needed (rounded up)
*/
export function calculateShingleBundles(squares: number): number {
return Math.ceil(squares * 3); // 3 bundles per square
}
/**
* Calculate rolls needed for underlayment
* @param area_sqft Total area in square feet
* @param coverage_per_roll Coverage per roll in sq ft
* @returns Number of rolls needed (rounded up)
*/
export function calculateRolls(area_sqft: number, coverage_per_roll: number): number {
return Math.ceil(area_sqft / coverage_per_roll);
}
/**
* Calculate linear feet material needed
* @param length_lf Linear feet needed
* @param coverage_per_unit Coverage per unit in linear feet
* @returns Number of units needed (rounded up)
*/
export function calculateLinearMaterial(length_lf: number, coverage_per_unit: number): number {
return Math.ceil(length_lf / coverage_per_unit);
}
