International Association of Certified Home Inspectors
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| Structural Inspections Contains discussions about the structural portion of a home inspection. This includes foundations, framing, etc. |
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#1
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I was just asked about nail sizes and pennies. In the U.S., the length of nails is designated by "penny" abbreviated "d". For example a twenty-penny nail (20d) has typically has a length of four inches. See table (attached picture).
![]() Talk to you later. BEN GROMICKO InterNACHI Director of Education 'Now That You've Had a Home Inspection' Book Home Inspection Training Video on USB |
| Need a home inspection in Rhode Island? Check out InterNACHI's listing of Rhode Island certified home inspectors. Or, find a home inspector anywhere in the world with our inspection search engine. |
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#2
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(just kiddin, Ben) How about ed-u-ma-catin' us on why the term "penny" is even used, and why a 4" nail is called a 20d, as opposed to... lets say... 4d or 16d ? Jeffrey R. Jonas Critical Eye Property Inspections JRJ Consultants Owatonna, Minnesota Chapter President InterNachi Awards Portal: http://co.nachi.org/inachiawards/
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#3
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Ah... You could probably look that stuff up on a Google search. It all comes from old English way of measuring - 600 nails could be bought for six pence or six penny, etc. yada yada.
BEN GROMICKO InterNACHI Director of Education 'Now That You've Had a Home Inspection' Book Home Inspection Training Video on USB |
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#4
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Depending on which story you believe, the term penny was derived in England based upon the number of pence you paid for a pound of nail. Being that the larger nails cost more you there for have a larger designation.
The "d" is derived from denarious, a roman coin similar to the penny. The most common nails you see in construction are the 6d, 8d, 12d, and 16d. Nails over 4"- 20d, are commonly referred to as spikes. The most common problem you find in regards to home inspections and nails are improper sized and wrong application, especially with common nails being used in pressured treated materials. Those who do phased inspections can easily pick apart a house if they so choose....especially in regards to exterior sheathing, joist and trust fastening. Your basic 16d cc fastener has a minimum of 200 # of holding power.... at least according to an engineer that I work with from time to time...... I can also attest that when driven through you hand or foot, which I have done at least a half dozen times with a nail gun........... they are difficult to get out......although I have never measured the force it takes to pull one out, it does in deed hurt. |
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#5
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Jeffrey R. Jonas Critical Eye Property Inspections JRJ Consultants Owatonna, Minnesota Chapter President InterNachi Awards Portal: http://co.nachi.org/inachiawards/
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#6
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Jeff,
Thanks for the info (BTW Ben, I am familiar with most of it)... And the testimonial to the holding strength... Hope none of them were ring-shanked... Jeffrey R. Jonas Critical Eye Property Inspections JRJ Consultants Owatonna, Minnesota Chapter President InterNachi Awards Portal: http://co.nachi.org/inachiawards/
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#7
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Might at well add a little history to this topic.
The term penny, as it refers to nails, is thought to have originated in medieval England to describe the price of 100 nails. (e.g. 100 3-1/2 nails would cost 16 pence, while 100 2-1/2 nails could be bought for 6 pence.) This system of classifying nails by size according to price was in place by 1477 AD. The letter d, which means penny, stands for the Latin name given to Roman Coins, Denarius. The size of the nail is determined by measuring its length. Nails start at 2d, which is 1 in length, and range up to 60d which is 6 in length. From 2d to 16d the penny length increases by quarter inches. Above 16d, the size increases by half inches. Nails longer than 60d or shorter than 2d are described in inches or fractions thereof. LEED Green Associates InachiAwardsPortal: Inachi US Member of the Year Award 2009 |
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#8
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amazing what you old guys know... |
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#9
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Jeff if you have driven 16 sinkers through hand or foot at least a half dozen times You might want to think about slowing down just a tad.... |
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#10
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"not just an inspection, but an education" www.homesweethomecincinnati.com Democracy is two wolves and a lamb. Liberty is a well-armed lamb. B. Franklin |
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#11
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Hey, what's all this talk about old guys.?
Jae 's got me beat by a couple of decades. LEED Green Associates InachiAwardsPortal: Inachi US Member of the Year Award 2009 |
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#12
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sorry i couldn't help myself....
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#13
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Quote:
Jeffrey R. Jonas Critical Eye Property Inspections JRJ Consultants Owatonna, Minnesota Chapter President InterNachi Awards Portal: http://co.nachi.org/inachiawards/
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| Need a home inspection in Rhode Island? Check out InterNACHI's listing of Rhode Island certified home inspectors. Or, find a home inspector anywhere in the world with our inspection search engine. |
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#14
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Thanks a lot buddy.
LEED Green Associates InachiAwardsPortal: Inachi US Member of the Year Award 2009 |
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#15
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My son asked me the other day why my left hands shakes but not my right............... I told him because its scared of my right hand........... it has a tendency to shoot my left hand when given a chance. As for as slowing down..... I just keep my tetanus shots updated. |
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