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ATECTONIC
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June2'1,2023
John Plano
Garfield County
Chief Building Official
108 8th Street Suite 401
Glenwood Springs, CO 81601
Re Atlantic Aviation Hangar 6
Rifle Airport Rifle CO
375 County Road 352, Building #3070
Perm it #BLCO-04-23-8050
Atlantic Aviation
TMGI Project: MS-RIL, Hgr 6
TMGI Project #:202209
John,
We have received your comments on the proposed new hangar facility for Atlantic Aviation and have the
following response to those items. We are reissuing the revised drawings reflecting the direction indicated in
the narrative.
Gorrections to address orior to issuino a buildino oermit: lFrom the Review Gomments)
1 The lnternational Fuel Gas Code references NFPA 409 regarding Mechanical Installations. The
Boiler Room 112is a concern. IBC and NFPA 409 indicates this room is not to have direct
access from the aircraft storage area. The IBC has exceptions; if the room is accessed from the
aircraft storage area a vestibule is required or raise all sources of ignition to eliminate the
vestibule. Please address accordingly. (lBC 412.4.4,1FGC-305.11, NFPA 409-5.12.3.1)
The proposed door location has been moved to access Boiler Room 112from the adjacent GSE
Room 108. This will eliminate the direct access from the Boiler Room to the Hangar. (See the
attached Floor Plan)
2 Boiler Room 112is to be separated from the aircraft storage area by 2-hour fire barriers and 2-
hour ceiling assembly. The plans are indicating one-hour ratings. Please address accordingly.
(rBc 412.4.4)
The separation of Boiler Room 112has been changed to a 2-Hour rating. A new partition type and
ceiling assembly has been added to the drawings indicating a UL 2-Hour rating. (See the attached
Floor Plan)
Atlantic Aviation Rifle Hangar 6
20229 AAS-RIL, HGR 6
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3 As the Boiler Room is to be constructed as 2-hour fire barriers. lf using one of the
exceptions in IBC 412.4.4, Door 1 12 is to have 1 /"hour fire-rating. Please address
accordingly. (lBC Table 716.5)
The rating on Door 112has been changed to a 11/rHour rating. (See the attached Floor Plan)
4 How is the distance between hangers being addressed? IBC Section 412.4.1 requires 30'to lot
lines or public way. lt appears the lease boundary would be considered the lot line for each
individual hanger. IBC 705.3 address buildings on the same lot, requiring an imaginary line be
proposed to separate these buildings. lt appears the code is requiring 30'to the lease boundary
lines or 2-hour walls are required. Lease Parcel 1OFL, to the south, scales at27'to this new
hanger. Please clearly show the lease boundary on the drawings and add fire-resistive walls
accordingly. (lBC 412.4.1)
The proposed hangar facility is located with lease lines around the perimeter of the site. There are no
property lines. The paved drive to the East of the project is not a public road being that it is airside at
the airport and not accessible to the public. The attached Site Plan drawing indicates the location of
the lease lines and has dimensions from the lease line to the proposed building location. From that
exhibit we need to address the South and East lease lines.
To the South, the property owner needs to maintain clear access to the Helipad indicated on the
drawing, this is the only access to the pad from the airport ramp. ln speaking to Brian Condie, this
open area will need to be maintained, otherwise the site will have no access to the ramp. Based on
this information, and that we are within 27' of a proposed lease line, we don't see the need for the
required 2-hour wall in the hangar. At other airport projects we have not been requlred to build in a
rated wall in anticipation of a future project occurring on the adjacent site. There are provisions in
NFPA 409 that would allow a future hangar to be built with a 2-hour wall and still be able to maintain a
25' clearance to an adjacent structure. This could occur in the future with the hangar being placed 27'
away from the lease line. (See the attached Site Plan)
The roadway to the East is 27' from the side of the hangar. Again, after reviewing this situation with
Brian Condie, this is not a public road and from the Airport Development Standards a drive must be a
minimum of 20', the current driveway to the East is about 25' wide. Based on this information we don't
see the need to require a 2-Hour wall on the East side of the hangar.(See the attached Site Plan)
5 The Mezzanine is shown at approximately 928 square feet. The egress is shown as a ladder
This area does not comply for the utilization of a ladder for egress. Please see IBC sections
1011.14 forAlternating Tread Devices, section 1011.15forShips Ladders, and 1011.16for
Ladders. Please address accordingly.
This mezzanine area of the building is primarily being used to accommodate some minor
mechanical equipment. The floor structure is also being used to support the ceiling of the finished
areas on the first level of the building. With the limited ladder access, we don't see the space being
used for much storage. The 2015 IBC allows alternative materials, design and methods of
Atlantic Aviation Rifle Hangar 6
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construction and equipment per Section 104.11 of the code. For the mezzanine area of the
building, we are proposing to install a second access ladder to the platform. This additional ladder
will provide two exit paths from the mezzanine area. The second ladder would match the detailing of
the original ladder and would be placed on the opposite end of the mezzanine.
The two ladders provide an alternate method of exiting the space. The revised drawings indicate the
modification.
Please let me know if you have any questions or would like to have a call to discuss any of these items
Thank you,
Kevin Larson
Atlantic Aviation Rifle Hangar 6
20229 AAS-RIL, HGR 6
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