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St. Mary’s County, Maryland Building Codes

Updated : 04/22/2024

Overview

Saint Mary's County, MD, adopted the 2018 IBC and IRC. Saint Mary's County, MD, Municipal Code § 203.11 (adopted), § 203-12 (IBC amended), § 203-13 (IRC amended).

Helpful resources for St. Mary’s County, Maryland include the following.

Residential Building Code

Maryland adopted a model state residential code but it is not in force unless adopted locally.See PLRB, Maryland Building Codes for more information on state level codes.

St. Mary’s County adopted the 2018 IRC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the model code here.

You can find information about amendments to the model code here.

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Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for St. Mary’s County ? Yes
Citation: St. Mary's Code of Ordinances Sec. 203-13. - Modifications to International Residential Code.
Municipal Code https://www.stmarysmd.com/docs/stmarysbuildingcode.pdf
Comments:

Ice and water shield underlayment is required for a single family residence in St. Mary's County, MD. The county adopts the 2018 IBC and IRC, which is the state code. See St. Mary's Code of Ordinances Sec. 203-13. – Modifications to International Residential Code. Also see https://www.stmarysmd.com/docs/stmarysbuildingcode.pdf (see pg. 49 of 73).The amendments modify Table R301.2(1) regarding Design Criteria. The 2018 IRC requires ice barrier underlayment if there has been a history of ice barriers forming as indicating by the local jurisdiction in Table R301.2(1). 2018 IRC R905.2.8.7 and R905.1.2. The county modifies The design criteria as follows; ice barrier underlayment is required.

Drip Edge flashing is likely required for a single family residence in St. Mary's County, MD. The county adopts the 2018 IBC and IRC, which is the state code. See St. Mary's Code of Ordinances Sec. 203-13. – Modifications to International Residential Code. Also see https://www.stmarysmd.com/docs/stmarysbuildingcode.pdf. The amendments do not modify chapter 9 regarding roofing. The 2018 IRC requires drip edge flashing. 2018 IRC R905.2.8.5. "A drip edge shall be provided at eaves and rake edges of shingle roofs." Id.

 

Comments

St. Mary's County, MD, adopted the 2009 IBC and IRC. St. Mary's County, MD, Municipal Code § 203.11 (adopted), § 203-12 (IBC amended), § 203-13 (IRC amended).

Existing Buildings

Existing buildings, meaning buildings that were built in accordance to code at the time of construction, typically merit extra consideration in a current updated code.

St. Mary's County, MD, does NOT appear to have adopted Appendix J as part of the code. St. Mary's County, MD, Municipal Code § 203.11 (adopted), § 203-12 (IBC amended), § 203-13 (IRC amended). Appendix J provides guidance on existing buildings.

Commercial Building Code

St. Mary’s County adopted the 2018 IBC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the code here.You can find information about amendments to the model code here.

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Comments

St. Mary's County, MD, adopted the 2009 IBC and IRC. Saint Mary's County, MD, Municipal Code § 203.11 (adopted), § 203-12 (IBC amended), § 203-13 (IRC amended).

Existing Buildings

St. Mary's, MD, adopted the Maryland Building Rehabilitation Code, which follows the 2012 IEBC.

Other Building Codes

 2005 National Electrical Code