House illustrations from A to Z

House illustrations Index for I - O

Use the House illustrations Index pages to find specific images. For example, if you would like to find illustration images of "electrical wires", you could use the find feature of your web browser to search for "electrical" or "wires" on the House illustrations Index pages. Then you can use the House Illustration navigation menus for the specific category to find and view the image. Use the "Sort Gallery By" links above the illustrations to sort in ascending/descending order. You can also type the image description text and-or the image four-digit ID number in our site Search box to find the specific category for that exact house illustration image (A/C-Heat Pumps, Electrical, Exterior, Heating, Insulation, Interior, Plumbing, Roofing, Structure).

Click to go to section: I - J - K - L - M - N - O

I
I joists - Wood 0442
Ice Dam 0006, 0007, 0008
----- at Skylight 0083
----- below Skylight 2058
----- on Party Walls 2016
----- Preventing with Ventilation 1342
Ice on Gas Regulator 0718
----- for Water Heater 1569
Igniters
----- Crossover for Gas Burners 0740
----- Gas for Fireplaces 1095
Ignition - Hot Surface 0799
Illegal Electrical Taps 0543
Improper Sidewall Vent Locations for High Efficiency Gas Furnaces 0807
Improper Sidewall Venting of Gas Appliances 0802
Improper Slope on Chimney Cap 0984
Inadequate Wire Clearance over Roofs 0519
Incomplete Chimney Liner 0980
Indoor Caulking 0337
Inoperative Aquastat 0868
Inserts for Fireplaces - Flue Connections 0950
Inside and Outside Corners on Siding 0783
Inspecting an Oil Burner 0832
Inspecting High Efficiency Furnaces 0813
Inspecting Pressure Relief Valves on Boilers 0854
Inspecting the Service Box and Panels 0562, 0565
Inspection Cap Missing or Damaged for Floor Furnace 1161
Insulated Ceilings with Potlights 0607
Insulated Exterior Basement Stairwell 0239, 1875
Insulated Metal Doors 2063
Insulating Cathedral and Flat Roofs - Two Strategies 1379
Insulating Combustion Air Ducts for Fireplaces 1090
Insulating Cover Missing on Whole House Fan 1376
Insulating Crawlspaces 1388
----- Clues 1389
Insulating Embedded Joists 1391
Insulating Flat and Cathedral Roofs 1377
Insulating Knee Walls 1365
Insulating Skylight Wells 1366
Insulation
----- Added to Flat and Cathedral Roofs - Evidence 1378
----- Adding Exterior Basement 1385
----- Adding Interior Basement 1386
----- Adding to Solid Masonry Walls 1382
----- Behind Radiators 0715
----- Combustible in Basements and Crawlspaces 1392
----- Combustible in Garages 1858
----- Forms 1329
----- Holes in Siding 1752
----- in Floors over Unheated Areas 1394
----- Levels - Recommended 1309
----- Missing at Dropped Ceiling 1364
----- on Foundation Exteriors 1884
----- Rim Joist 1390
----- Risks of Adding More 1362
----- Short Circuits in Walls 1381
----- the Basics 1300 - 1325
----- too Close to Chimneys 1368
----- Voids and Convective Loops 1327
----- Wet below Roof Vents 1363
Insulbrick 1808
Intake and Exhaust Locations for Heat Recovery Ventilators 1355, 1398
Integral Curb Skylight on Sloped Roof 0082
Integral Gutter 1894
----- Repairs 1899
Interior Basement Insulation - Adding 1386
Interior Ceilings 2017-2020
Interior Doors 2059-2066
Interior Drainage System for Leaky Basements 2081
Interior Flat Roof Drain 1893
----- Clog 1918
Interior Floors 2002-2008
Interior Lintel - Sagging 0389
Interior Stairs 2024-2035
Interior Stairwell Lighting 2020
Interior Walls 2009-2016
----- Common Locations for Water Damages 2011
----- Inspecting 2010
----- Shadow Effect 2013
----- Structural Clues 2012
----- Used to Repair Foundations 0260
Interior Water Damage Source to Flooring 2004
Interlocking Shingle Clay Tile 0042
Intermittent Pilotlight 0798
International Style 1739
Inverted Roof Membrane Assembly 0089
Ionic Column 1722
Isolating Links Needed on Pull Chains
----- for Electric Lights 0610
Italian Renaissance Style 1728
Italianate Style 1729

J
J Molding around Windows - Metal and vinyl siding 1804
Jack Stud Support 0374
----- on Wide Openings 0387
Jalousie or Louver Windows 1717
Jet Pump
----- Two Line for Well 1525
----- with Single Line for Shallow Wells 1524
Joining Vent Connector Sections for Wood Furnaces 1023
Joints - Mortise and Tenon 0324
Joints in Metal Valley Flashing 0058
Joints in Siding Boards 1790
Joist-Beam Connections 0306
Joists 0311-0331
----- Attached to Beams with Ledger Boards 0323
----- Attached to Steel Beams 0295
----- Cantilevered 0328
----- Ceiling - Overlapped Splices 0412
----- Ceiling - Plywood Splices 0413
----- Crack - Causes 0327
----- Crown up 0315
----- don't Insulate if Embedded 1391
----- End Support 0320
----- Fire Cut 0314
----- Floors - Types 0311
----- Notching and Drilling 0326
----- Overlap - Excessive 0319
----- Rim 0316
----- Roof 0411
----- Sagging Correction 0317
----- Strapping, Bridging and Blocking 0318
----- Support 1843
----- Wood I 0442
Jumper Wires for Electric Grounds 0552, 0553

K
Kickout Flashing 1820
----- for Stucco 1776
Kilowatts vs. BTUs 1133
Knee Walls 0432
----- Insulating 1365
Knob and Tube Wiring 0600-0603
----- Connecting a New Circuit 0602
----- Connections 0601

L
L Vent 0996
Landings for Stairways - Exterior 1829
Latent Heat of Vaporization 1209, 1301
Lateral Foundation Support by Floors 0245
Lateral Support
----- by Basement Floors 0255
----- for Exterior Masonry Walls 0312, 0344, 1766
----- for Foundation Walls 0249
----- for Masonry Chimneys 0961
----- for Steel Beams 0308
----- for Wood Beams 0309
Lateral Thrust Causing Cracking around Masonry Arches 0403
Leaking Downspouts 1906
Leaking Gutter - Causes 1898
Leaking Windows - Look Behind Window Treatments 2001
Leaks - Oil Storage Tanks 0823
Leaks in Skylights and Solariums 2049
Leaning Chimneys 0975
Ledgerboard
----- Flashing 1846
----- for Joist to Beam Connections 0323
Length of Exhaust Flue for Oil Furnace 0841
Length of Vent Connector on Gas Furnace 0768
Light Fixtures - Importance of Correct Polarity 0612
Lighting for Stairways 0605, 2020
Lights Need Isolating Links on Pull Chains 0610
Linear Plan vs. Massed Plan 1700
Liner
----- for Chimney Incomplete 0980
----- for Chimney Flue for Fireplace Inserts 1037
----- for Flues - Clay Tile 0962
Links - Isolating for Pull Chains on Electric Lights 0610
Lintel
----- and Arch 0400-0406
----- in Load Bearing 0371
----- Interior Sagging 0389
----- Loads in a Masonry Wall 0400
----- Loads in Wood Frame Walls 0401
----- Related Wall Cracks 0356
----- Rusting in Masonry Wall 1759
----- Rusting, Sagging or Loose on Fireplace 1077
----- Sagging or Missing for Window 2050
----- Sagging or Missing on Door 2062
----- Steel
----- ----- End Bearing 0405
----- ----- in Brick Veneer Wall 0346
----- Wood
----- ----- End Bearing 0406
----- ----- Solid Masonry in Wall 0347
Load Bearing Wall with Lintel 0371
Load Distribution on Floors 0274
Load Miser - Electrical 0617
Load Transfer in Houses 0294
Loads - Concentrated in Structures 0310
Location
----- for Heat Lamps - Poor 0609
----- Issues for Gas Fireplaces 1166
----- of Air Leakage in Homes 1370
----- of Boiler Feed Pump for Steam Heat 1112
----- of Electric Meter 0537
----- of Pressure Reducing Valve on Boilers 0858
----- of Pressure Relief Valves on Boilers 0853
----- of Supply and Return Registers 0776
----- of Vapor Barriers 1339
----- Problems with Supply and Return Registers
----- on Forced Air Systems 0794
Long Heat Exchangers in High Efficiency Gas Furnaces 0803
Longitudinal Shrinkage in Wood 0019
Lot Grading 1880 - 1892
Louver or Jalousie Windows 1717
Low and High Returns for Forced Air Systems 0792
Low Quality Built-up Roof-Wall Flashing 0112
Low Slope
----- Roof - Defined 0001
----- Shingle Application - Roofing 0016
Low Water Cut-out for Steam Boiler 1114, 1119
----- on Hot Water Boilers 0856
Low-E Glass 2043
Lowered Basement Floors
----- Bench Footings 0230
----- Underpinning 0231

M
Main Air Vent on Steam Heating 1125
Main Electrical Panel 0532
Main Fuses
----- Downstream of Disconnect Switch 0545
----- must be Properly Sized 0542
Main Panel - Electric 0532
Main Shut Off Valve for Plumbing - Stop and Waste 1533
Making Babies for Slate Repairs 0037
Man Door in Garage 1857, 2066
Mansard and Gambrel Roofs - Venting 1348
Mansard Roof 0002
Marks on Walls due to Thermal Bridging 1326
Masonry Arches - Cracking due to Lateral Thrust 0403
Masonry Block Retaining Walls need Rebar and Cap 1937
Masonry Cavity Wall 0340
Masonry Chimney 0957
----- and Fireplace Components 0959
----- Components 0958
----- Lateral Support 0961
----- Settling 1066
----- Tall 0971
Masonry Damage
----- due to Freezing 1757
----- Rising Damp 1756
Masonry Fireplace Components 1061
Masonry Mortar Joints 1761
Masonry Piers - Hollow Channels must be Vertical 0265
Masonry Repointing 1758
Masonry Roof-Side Wall Flashings 0076, 0077
Masonry Tie Detail in Brick Veneer Wall 0391, 1765
Masonry Veneer Wall 0390-0399
----- Bowed 1764
----- Construction Detail 0390
----- Masonry Tie Detail 0391
----- vs. Solid Masonry 1753
----- Weep Holes 0394
Masonry Wall 0339 -0365
----- adding Insulation 1382
----- Bowing 0313, 0357, 1767
----- Extending above Ceiling Joists 0345
----- Lateral Support 0312, 0344
----- Lintel Loads 0400
----- needs Lateral Support 1766
----- on Brick Foundation 0212
----- on Stone Foundation 0213
----- Solid 0339
----- with Diagonal Brick Bond 0343
----- with Rusting Lintels 1759
----- with Wood Lintel 0347
Massed Plan vs. Linear Plan 1700
Mat and Raft Foundations 0215
Maximizing Temperature Differences in High Efficiency Gas Furnaces 0805
Mercury Bulb Thermostat 0743
Metal and Vinyl Siding 1800-1804
Metal Chimney 0995-1009
----- Adjacent - Different Heights 1009
----- Bracing 1001
----- Cap Missing 1004
----- Class A 0997
----- Combustible Clearances 1002
----- Height 1006
----- Not Continuous Through Roof 1008
----- Offset From Vertical 1007
----- Pitting or Rusting 1005
----- Triple-Wall 0998
Metal Clad Parapet Wall 0115
Metal Doors - Insulated 2063
Metal Drip Edge - Roofing 0011
Metal Firebox
----- Flue Liner Issue 1075
----- Clearance 1074
Metal Flashing Joints 0058
Metal Shingles 0049
Metal Siding
----- Flashing below Windows 1803
----- Mounting Blocks 1802
----- Nailing too Tightly 1801
Metal Spark Strip for Fireplace Hearths 1068
Metal Ties for Connections in Single Top Plates 0370
Metal Valley Flashing 0057
----- Alternate Applications 0060
----- with Upstand Up 0061
----- Secured With Cleats 0059
Metal Vent 0995-1009
----- B Vent 0995
----- L Vent 0996
----- Piece Connections 1000
Meter for Gas - Poor Location 0719
Meter Location - Electric 0537
Mid Efficiency
----- Gas Furnace 0798-0802
----- Oil Furnace 0844
Minimum Vent Height for Wall Furnace 1157
Miser - Electrical - load 0617
Missing Chimney Cap - Metal 1004
Missing Insulation at Dropped Ceiling 1364
Mission Style Home 1741
Miter Flue Liners 0964
Mitered Corners on Wood Siding 1788
Mixing Systems for Hot Water Heating 0894
Modernistic Style 1738
Modified Bitumen Roof 0097-0099
----- Single-ply 0097
----- Staggering Side Laps in Single-ply 0099
----- Two-ply 0098
Modified Bitumen Roof-Wall Flashing 0105
Moisture
----- Control in Basements 1387
----- Controlling in Hot Climates 1319, 1325
----- How it Moves 1312
----- Reducing 1395
----- Trapped behind Siding 1318
Monolithic Slab - Slab-on-grade 0208
Monoport Gas Burners 0738
Mortar Joints - Common 1761
Mortar Joints in Brick Walls 1762
Mortise and Tenon Joints 0324
Mounting Blocks for Metal and Vinyl Siding 1802
Mounting of Electrical Panels 0541
Movement of Moisture 1312
Movements of Retaining Wall 1936
Mud Jacking 0225, 1862
Mud Sill 0280
Mullion 1718
Multi-Wire Branch Circuits
----- Electrical Wiring for 0616
----- Over-current Protection 0578
----- Pull-out Fuse Blocks 0581
Muntin 1718

N
Nail Details - Slate Roofing 0033
Nail Popping 2014
----- on Stucco 1773
Nailing Controversy on Siding 1781
Nailing Details
----- for Cedar Shakes 0025
----- for Wood Shingle Roots 0022
----- for Wood Shingle Siding 1785
Nailing of Asphalt Shingles 0011, 0013
Nailing of Wood Built-up Beams 0302
Nails - Good in Shear 0276
Nails in Joist Hangers 0307
Natural Draft Burners 0731
Need for Ground in Subpanel Feeder Wires 0556
Neoprene Plumbing Stack Flashing 0071
Neutral and Ground Wires should not be Bonded Downstream of Service Box 0554
Neutral Pressure Plane 1314
Neutral Wires Bypassing the Service Box 0544
Nogging 1711
Non-load Bearing Walls 0330
Notches and Holes
----- in Top Plates of Bearing Walls 0369
----- in Beams 0301
Notching and Drilling in Joists 0326
Notching and Drilling Studs 0378
Notching of Studs 0384
Number of Electrical Conductors 0588

O
Obsolete Electrical Push-button Switches 0623
Obstructed Flue or Vent Connector 0989
Obstruction in Exhaust Flue on Oil Furnaces 0843
Offset Bearing Walls 0388
Offsets in Chimneys 0963
Oil and Wood Appliances Connected to Chimney on Same Floor Level 0994
Oil Burner
----- Atomizing 0829
----- Barometric Damper Problems 0837
----- Clearance from Oil Storage Tanks 0822
----- Flame Sensor 0835
----- Inspecting 0832
----- with Flame Retention Head 0830
Oil Fired Water Heaters 1561
Oil Furnace
----- Barometric Damper 0836
----- Emergency Shutoffs 0828
----- Exhaust Flue
----- ----- Clearances 0842
----- ----- Length 0841
----- ----- Slope 0839
----- ----- Support 0840
----- Mid Efficiency 0844
----- Obstruction in Exhaust Flue 0843
----- Primary Control 0831
----- Sidewall Vent Problems 0845
----- Sidewall Vented 0844
----- Spillage from Barometric Damper 0838
----- Stack Controller 0831
----- Stack Relay 0831
Oil Storage Tank 0820 - 0828
----- Buried 0820
----- Caps for Fill and Vent Pipes 0826
----- Clearance from Oil Burner 0822
----- Clearances from Wood Stoves 1053
----- Exterior above Ground 0821
----- Fill and Vent Piping 0825
----- Leaks 0823
----- Underground 0824
----- Undersized Fill Lines 0827
Oil-Wood Furnace 1033
Old and New Construction Re-insulating 1320
Old Wiring Systems with Fused Neutrals 0566
One Flue
----- Serving Two Fireplaces 0992
----- Serving Two Gas Appliances 0993
One Pipe Hot Water Heating System 0877
One-Third Rule for Wall Stability 0263
One-Twenty Volt Circuit - Color-coding 0506
One-Twenty-Two-Forty Volts 0505
Open Hot Water Heating System 0874
Open Hydronic System 0874
Open Roof Valleys 0053
Openers for Garage Doors 1867 - 1871
Openings in Electric Panels 0540
Openings in Roofs 0430
Oriel Window 1720
Oriented Strandboard (OSB) Siding 1795
Oriented Strandboard Sheathing 0377
Outdoor Air Temperature Sensor for Boiler 0872
Outdoor Caulking 1337
Outdoor Combustion Air for Fireplace 1089
Outdoor Combustion Air Supplies 0735
Outdoor Fire 0704
Outdoor Intake Screening for Combustion Air for Fireplaces 1091
Outlets
----- and Switches in Bathrooms - Electrical 0618
----- in Floors or Countertops 0621
----- near Basins 0619
----- should not be above Electric Baseboard Heaters 0620
Over-current Protection for Multi-wire Branch Circuits 0578
Overflow Pipe for Expansion Tanks on Hot Water Heating Systems 0882
Overhang for Gable
----- less than 16 Inches 0421
----- more than 16 Inches 0422
Overhangs of Wall Plate 0373
Overhead Electrical Wire - Stranded 0587

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