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Old 09-12-2011, 08:01 PM   #1
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footing sizes for deck in md


Hi all- I am looking to build a deck out back. The deck will be attached via a ledger board to double thick brick (using epoxy anchors - epcon a7).

Rough dimensions are 12x17 and I plan to have 5 posts on a beam that is approximately 11' off the ledger.

According to Montgomery County, MD's website, the requirement for footer diameter is 22" in diameter. If I calculate that out it is almost double what I need for load on each footer using this site -> http://www.ideasfordeckdesigns.com/c...calculator.php

Am I reading the requirement right? (http://permittingservices.montgomery...%20Package.pdf)

22" seems like a ridiculous requirement for a deck. I figure if I use 14" or 16" footers (soil bearing 2000 psf) I should have margin to spare and be safe.

Thoughts?

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Old 09-12-2011, 08:28 PM   #2
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footing sizes for deck in md


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Originally Posted by noname003 View Post
Hi all- I am looking to build a deck out back. The deck will be attached via a ledger board to double thick brick (using epoxy anchors - epcon a7).

Rough dimensions are 12x17 and I plan to have 5 posts on a beam that is approximately 11' off the ledger.

According to Montgomery County, MD's website, the requirement for footer diameter is 22" in diameter. If I calculate that out it is almost double what I need for load on each footer using this site -> http://www.ideasfordeckdesigns.com/c...calculator.php

Am I reading the requirement right? (http://permittingservices.montgomery...%20Package.pdf)

22" seems like a ridiculous requirement for a deck. I figure if I use 14" or 16" footers (soil bearing 2000 psf) I should have margin to spare and be safe.

Thoughts?
Call your building department and ask them. They will probably tell you that you can't ledger into brick.

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Old 09-12-2011, 08:56 PM   #3
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footing sizes for deck in md


The house is made of all brick. I've seen references to ledger against brick. See the following

http://alexandriava.gov/uploadedFile...2010.09(1).pdf (page 12)

http://www.emcoblock.com/pdf/divisio...ck-masonry.pdf

Double brick doesn't qualify as brick vener does it?
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Old 09-12-2011, 08:59 PM   #4
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footing sizes for deck in md


Say I made it freestanding, how does that impact footing size?
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Old 09-12-2011, 09:26 PM   #5
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footing sizes for deck in md


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Originally Posted by noname003 View Post
Say I made it freestanding, how does that impact footing size?
according to the code, it seems like it doesn't impact diameter at all


Footings shall be minimum 20 inches square or 22 inches diameter (Figure 5). Bottom of footings

shall be a minimum of 24 inches below grade and shall bear on solid ground. For freestanding decks,
the footings close to the house must be installed as shown in Figure 6. Distances to the edges to the
footing and embedment of connectors must be in accordance with the manufacturer’s
recommendations

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Old 09-12-2011, 09:31 PM   #6
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footing sizes for deck in md


I'm not going to get a permit, but I am trying to build to code.

That aside, am I correct in saying that this requirement is extremely excessive?

Second, since my house is fully brick construction, does my ledger attachment method still pass muster?
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Old 09-12-2011, 09:50 PM   #7
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I'm not going to get a permit, but I am trying to build to code.
doesn't your code require you to pull a permit? this is like saying "I don't have a drivers license put am following all the rules of driving"
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Old 09-13-2011, 05:23 PM   #8
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footing sizes for deck in md


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Say I made it freestanding, how does that impact footing size?
It will effect footing depth. A footing within 5 feet(or so) of the foundation would require the depth to be down to the houses footings. Based on the fact that that soil was back fill and not undisturbed soil.
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Old 09-13-2011, 11:16 PM   #9
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footing sizes for deck in md


Thanks for all the replies. I'm still trying to understand the following...

1. am I correct in saying that this requirement is extremely excessive?

2. since my house is fully brick construction, does my ledger attachment method (backer board where back side of wall is accessible, epoxy anchors where it is not) still pass muster?

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