LCI Preconstruction & Estimating Training Manual

Floor To Skin Ratio Analysis (By Elevation) - Including Substructure Framing/Backup

Floor Area

Skin Area

Description

Ratio Of Assembly to Skin

Glazing Curtain Wall - STC 32 Curtain Wall - STC 34/35

20,018

SF SF SF SF SF SF SF SF SF SF SF SF SF SF SF SF SF SF SF

13.42%

8,457

5.67% 9.70% 3.59%

Glazed Windows - Standard 1" IGU - STC 32

14,469

Glazed Windows - Standard 1" IGU with Opaque Film - STC 32 Glazed Windows - Unbalanced lite or sgl laminated - STC 34/35

5,357

19,940

13.37%

Glazed Windows - Dbl laminated - STC 39

6,856

4.60% 0.56% 1.36%

Sliding Nana Wall System Aluminum Sill Extension

832

2,023

Masonry Face Brick (concrete substrate)

37,583

25.20%

Face Brick Returns Brick Accent Wall

9,297 3,025

6.23% 2.03% 0.52% 0.10% 0.05% 0.13% 0.08% 2.51% 0.53% 0.82%

Limestone cap

780 142

Limestone Accent

Limestone Accent Returns

81

Granite Veneer

196 116

Granite Veneer Returns

Split Face CMU

3,749

Face Brick (CMU substrate)

795

Face Brick (metal stud substrate)

1,227

Steel and Metal Painted C-Channel Steel

690 509

SF SF

0.46% 0.34%

Metal Louvers

Metal Panels Metal Panel Column Cladding Metal Panel Wall Assembly

1,536

SF SF SF

1.03% 0.21% 0.30%

316 441

Metal Panel Soffits

EIFS EIFS Exterior Wall Assembly

4,017 6,681

SF SF

2.69% 4.48%

EIFS Soffits

149,133.00 SF

100.00%

Optimal Skin Ratio Per Design - Ratio

0.45 0.56

Percentage increase of exterior skin over optiomal

20.1%

Per Design Skin Sq.FT (0.56 Ratio)

149,133 119,171 29,962

Optimal skin design Skin Sq.FT (0.45 Ratio)

Square footage delta

Average skin cost

$

70.54

Added cost premium

$

2,113,581.18

Premium per Gross Square Footage

$

7.98

10/31/2016 Return to Table of Contents

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