TCI - AkANG Armory Walls - Structural Evaluation Report - 24 March 2026 Page 1 of 5

TCI Construction Co. 24 March 2026

3680 South Lathrop Street

Fairbanks, Alaska 99701

Attn: Chris Bunch

Re: Alaska Army National Guard Readiness Center –

Structural Evaluation of Fire Damaged Concrete Walls

202 Wien Street

Fairbanks, Alaska 99701

General:

Martin Engineering, Inc. (MEI) was contacted by you, Chris Bunch of TCI Construction Co. (TCI) concerning the structural integrity of exterior concrete walls that had been damaged by a fire originating in the building’s boiler room on 23 January 2026. It is MEI’s understanding that a natural gas line had been broken in the boiler room and was the cause of an explosion and fire in the boiler room. The local fire department was on site when the explosion occurred, and the fire was extinguished in a short period of time.

The original building was constructed around 1961 and consists of a concrete foundation, concrete tilt-up wall panels and concrete support columns to form the exterior walls. The roof of the original

1961 structure is a steel framed roof supported on the concrete columns. For the remainder of this report the original structure will be referred to as ORG.

A wood framed addition was added to the West exterior wall of the ORG around 1989 per City of

Fairbanks Building Department records. For the remainder of the report the 1989 wood framed addition will be referred to as ADD.

The ADD is constructed of a concrete foundation, wood framed walls and Glu-Laminated Beams

(GLB) that are supported on the west wall concrete columns of the ORG. The GLB supports the roof of the ADD.

Located in the north end of the ADD is the boiler room. The explosion and resulting fire caused the

GLB in that room and an adjacent room to burn with enough intensity to damage the exterior face of two sections of concrete wall on the west face of the ORG. These walls will be referred to as Wall

‘A’ and Wall ‘B’. Please see the attached annotated plan view of the ORG and ADD that reference the walls and shows the areas affected by the explosion/fire.

T C

I - A k

A N

G A rm o ry

W alls - S tru ctu ral E v alu atio n

R ep o rt - 2

M arch

P ag e 2 o f 5

W all ‘A

’ h as an ex istin g steel d o o r cu t in at g ro u n d lev el as w ell as w in d o w s an d in su lated p an els lo cated o n th e u p p er h eig h t o f its w all. W all ‘A ’ is a n o n

-lo ad b earin g w all (d o es n o t su p p o rt th e ro o

f) an d serv es as p art o f th e sy stem th at en clo ses th e b u ild in g fro m th e ex terio r elem en ts (cu rtain w all).

W all ‘B

’ is a fu ll h eig h t w all w ith n o d o o r o r w in d o w p en etratio n

s. W all ‘B ’ w as o rig in ally a cu rtain all sim ilar to W all ‘A ’ as can b e seen in th e o rig in al co n stru ctio n p lan s d ated

. W all ‘B ’ h ad its w in d o w s/in su lated p an els rem o v ed

, filled in w ith co n crete an d a cast-in

-p lace co n crete sh ear w all, w h ich co m p rises p art o f th e m ain lateral resistin g elem en t (M

L R

) fo r th e W est w all lin e o f th e O

R G d u rin g a b u ild in g ad d itio n /ren o v atio n in

. T h e M

L R serv es to p rev en t th e b u ild in g fro m co llap sin g in a d esig n seism ic o r w in d ev en

t. W all ‘B ’ d o es n o t su p p o rt th e ro o f fo r g rav ity lo ad s.

M E

I p erfo rm ed sep arate site v isits to ascertain th e d am ag e to b o th

W alls ‘A

’ an d ‘B

’ an d d eterm in e w h at, if an y , rep airs n eed ed to b e p erfo rm ed o n each all.

O n

-S ite In v estig a tio n

D u rin g th e first tw o site v isits, M E

I u sed a steel h am m er to in itially su rv ey th e fire d am ag ed w alls

‘A ’ an d ‘B

’. S trik in g co n crete w ith a steel h am m er p ro v id es a to n e th at can id en tify w h eth er o r n o t co n crete h as su stain ed sig n ifican t d am ag e fro m a fire. M

E I p erfo rm ed im p act tests o n th e co n crete co lu m n s th at b rack eted w alls ‘A ’ an d ‘B

’ as w ell as th e w alls ‘A

’ an d ‘B

’. T h e resu lts o f th is in itial testin g o n th e first site v isit resu lted in co n firm atio n th at th e co n crete co lu m n s h ad n o t su stain ed an y easu rab le d am ag

e. H o w ev er, b o th w alls ‘A

’ an d ‘B

’ ex h ib ited h o llo w o r d ead to n es w h en stru ck ith th e steel h am m er in d icatin g so m e d eg ree o f d am ag e b y th e fire. T h e ex ten t o f fire d am ag e o

’ starts ab o u t 1 feet ab o v e g ro u n d lev el an d ex ten d s to ap p ro x im ately feet ab o v e fin ish g rad

e. T h e ex ten t o f fire d am ag e o n w all ‘B ’ starts ab o u t 4 feet ab o v e g ro u n d lev el an d ex ten d s to ap p ro x im ately feet ab o v e fin ish g rad e.

M E

I retu rn ed fo r a th ird site v isit w ith a S ch m id t H am m

er. T h e S ch m id t H am m er is a reb o u h am m er w h ich allo w s testin g o f in -p lace co n crete to d eterm in e th e d eg ree o f h ard n ess o f a p articu lar sectio n o f co n crete. T h e h ard n ess o f th e co n crete can b e co rrelated to a co m p ressiv e stren g th o f th e in -p lace co n crete.

M E

I tested th e o u tsid e face o f th e d am ag ed w alls ‘A

’ an d ‘B

’, th e in sid e an d o u tsid e faces o f th e b rack etin g co lu m n s an d th e in sid e face o f w all ‘B ’. T h e in sid e face o f w all ‘A

’ w as m o stly co v ered b in su latio n an d w as n o t accessib le fo r testin g . M

E I also tested w all p an els o n th e W est w alls th at w ere co n stru cted in th e sam e w ay as w alls ‘A

’ an d ‘B

’ b u t w ere n o t su b jected to an y fire d am ag e.

T h e S ch m id t H am m er g av e an av erag e resu lt o f 4 u n its w h en tested o n n o n

-fire d am ag ed sectio n s o f co n crete flo o r, an d faces o f th e co n crete co lu m n s an d th e in sid e face o f th e w all ‘B

’. T h ese resu lts p ro v id e co n firm atio n th at th e co n crete co lu m n s th at b rack eted th e affected w alls w ere n o t sig n ifican tly d am ag ed b y th e fire.

T h e S ch m id t H am m er g av e an av erag e resu lt o f 3 u n its w h en tested o n n o n

-fire d am ag ed w all p an els o n th e W est w all. T estin g o f th e o u tsid e face o f W alls ‘A ’ an d ‘B

’ in th e fire d am ag ed areas resu lted in av erag e resu lt o f 1 u its.

I - A k

A N

G A rm o ry

W alls - S tru ctu ral E v alu atio n

R ep o rt - 2

M arch e 3

M E

I d irected

T C

I to d rill in to a sectio n o f W all ‘B

’ th at ap p eared to h av e su stain ed th e m o st sev ere fire d am ag e as in d icated b y th e h eav y ch arrin g o n th e ex terio r face o f th at w all. A p p licatio n o f a m ech an ical ro to r h am m er an d d rill b it cu t th ro u g h th e first 1 /2

” o f co n crete. A fter p assin g th ro u h th e in itial co n crete a v o id w as d isco v ered b eh in d th is v en eer. T h e v o id w as m easu red to b e ap p ro x im ately

.5 in ch es d eep an d co n sisted o f lo o se ro ck an d cem en t p o w d

er. T h e lo o se ro ck cem en t p o w d er are ev id en ce th at th e tem p eratu re ex p erien ced b y th e co n crete w as su fficien t to rem v e all o f th e m o istu re fro m th e co n crete an d retu rn it to its o rig in al elem en ts o f cem en t an reg ate (ro ck

T C

I d id n o t en co u n ter an y rein fo rcin g b ar w ith th is in itial d rillin g in to th e fire d am ag ed w all ‘B

T C

I ex p an d ed th e h o le to ap p ro x im ately in ch es in d iam eter. M

E I tested th e so u n d co n crete fo u ap ro x im ately

” fro m th e o u tsid e face o f th e co n crete w all w ith th e S ch m id t H am m er an d reco rd ed av erag e resu lt o f ap p ro x im ately u n its.

M E

I d irected

T C

I to ex p an d th e size o f th e test p atch o n W all ‘B ’ to a 2 fo o t b y fo o t area. T

C I u sed w er h an d to o ls to rem o v e th e d am ag ed co n crete o n th e ex terio r face o f W all ‘B ’ d o w n to so u crete. N o rein fo rcin g w as en co u n tered in sid e th is 2 fo o t b y fo o t p atch . M

E I retu rn ed o n

-site fo r a fo u rth tim e an d th e su rface o f th e ex p o sed so u n d co n crete w as tested w ith a S ch m id t H am m er an ro v id ed an av erag e read in g o f 4 u n its. M

E I can co n clu d e fro m th ese resu lts th at th e fire d am ag e ex ten d s a m ax im u m o f 2 in ch es fro m th e o u tsid e face o f W all ‘B ’ to w ard s th e cen ter o f th e o rig in al in ch th ick co n crete tilt-u p w all p an

el. T h e 6 in ch th ick co n crete sh ear w all rem ain s u n d am a th e fire.

D u rin g o u r fin al site v isit, M

E I h ad T

C I d rill sev eral h o les alo n g th e co lu m n to w all in terface o f w all

‘A ’ an d its ad jacen t co lu m n . M o st o f th e h o les th at w ere d rilled rev ealed a d ep th o f ap p ro x im ately in ch o f fire d am ag ed co n crete. O n ly ab o u t a 1 fo o t len g th o f th e w all (ad jacen t to th e co lu m n ) h ad am ag ed co n crete th at w as 1

/2

” d eep

. M E

I w as ab le to ascertain fro m th e d rillin g p erfo rm ed

I th at th is w all o n ly h ad sig n ifican t d am ag e to th e ex terio r face fo r ap p ro x im ately feet h o rizo n tally fro m th e 1 fo o t tall sectio n o f ro o f fo r a to tal o f ab o u t 2 sq u are feet o f d am ag ed w all ad jacen t to th e co lu m n

C o n clu sio n s &

R eco m m en d a tio n s:

M E

I d eterm in ed fro m o u r site v isits th at W all ‘A ’ h as o n ly ab o u t 3 o f its to tal w all area affected fire d am ag

e. M

E I’s co n clu d es th at W all ‘A

’ is n o t in n eed o f an y stru ctu ral rep air o r rein fo rcem en

t. F ro m a stru ctu ral p ersp ectiv e, W all ‘A

’ m ay b e left in its A s-Is co n d itio n an d stru ctu ral rein fo rcem en t o r im p ro v em en ts are n eed

I - A k

A N

G A rm o ry

W alls - S tru ctu ral E v alu atio n

R ep o rt - 2

M arch e 4

A o rtio n o f th e in sid e face o f W all ‘A

’ (as w ell as an ad jacen t w all p an el th at w as n o t affected b y th e fire) w as rem o v ed d u rin g fire-fig h tin g o p eratio n s o n

Jan u ary

. M

E I reco m m en d s th at th e in sid e w all fin ish es b e rep aired as clo se as p racticab le to m atch th e ad jacen t w all fin ish

es. T h e co n tracto r w h o p erfo rm s th e rep airs to th e in sid e face o f th e fin ish es o n th ese w alls sh all leav e all o f th e ex istin g in su latio n in p lace, rep lace th e d am ag ed in su latio n w ith ro ck w o o l in su laito n an d o ly rem v e th e p laster fin ish as n eed ed to m ak e sq u are cu ts o v er ex istin g w o o d firrin g . T h e sq u are cu ts w ill facilitate in stallatio n o f a C em en to u s co ated g y p su m w all b o ard an d p ain t to m atch th e ex istin all co lo r as clo se as p racticab

le. B efo re rem o v in g an y o f th e ex istin g p laster, th e co n tracto r sh all em p lo y a co m p an y th at is certified to test fo r A sb esto s an d th en sam p le th e ex istin g p laster fo r

A sb esto

s. If A sb esto s is p resen t in th e ex istin g w all p laster, th e co n tracto r sh all fo llo w th e testin p an y ’s reco m m en d atio n s fo r rem o v al o f th e p laster th at co n tain s A sb esto s b efo re im p lem en tin e rem ain d er o f th e in terio r w all fin ish rep air.

T h e O

R G w as ex p an d ed in to alm o st d o u b le its o rig in al size. P art o f th e co n stru ctio n fo r th e ad d itio n in clu d ed im p ro v em en ts to th e O

R G

W est w all as w ell as o th er p arts o f th e O R

G . O n e o f th e im p ro v em en ts m ad e w as th e ad d itio n o f a 6 in ch th ick , fu ll h eig h t, cast in p lace co n crete sh ear w all o n th e in sid e face o f W all ‘B ’. T h is im p ro v em en t w as m ad e to im p ro v e th e lateral fo rce resistan ce o f th e O

R G fo r d esig n w in d an d seism ic ev en ts.

M E

I’s o n

-site tests sh o w th at o n ly th e o rig in al co n crete tilt-u p W all ‘B ’ w as d am ag ed in th e fire o f

Jan u ary

. T h e sh ear w all ad d ed in w as n o t d am ag ed b y th e fire. M E

I states th at th e d am ag e d o n e to th e o rig in al W all ‘B

’ d o es n o t affect th e o v erall stru ctu ral in teg rity o f th e cap acity o f th e O

R G to d ev elo p th e o rig in al d esig n g rav ity lo ad s o r lateral sh ear lo ad s in th e area o f W all ‘B

N o fu rth er stru ctu ral rein fo rcem en t o r rep airs are req u ired at th is tim e to W all ‘B

T h e d am ag ed ex terio r face o f W all ‘B

’ m ay b e left in

-p lace as it cu rren tly ex ists. M

E I reco m m en d s fillin g in th e 2 ft x ft test p atch w ith

T errafu se T F

S tru ctu ral R ep air C o n crete M o rtar o r an ap p ro v eq u

al. T h e p atch rep air w ill n eed to w ait u n til am b ien t ex terio r tem p eratu res ex ceed d eg rees

F ah ren h eit o r th e in stallatio n tem p eratu re reco m m en d ed b y th e m an u factu rer o f th e co n crete rep air m o rtar.

It is M E

I’s u n d erstan d in g th at th e n ex t p h ase o f th is p ro ject w ill b e to rep lace th e fire d estro rtio n s o f th e A

D D

. M E

I reco m m en d s th at th e rep lacem en t ro o f stru ctu re fo r th e A

D D is n o t d irectly su p p o rted o n th e o u tsid e face o f th e O R

G co lu m n

s. M

E I reco m m en d s th at th e rep lacem en t ro o f is su p p o rted b y w o o d fram ed w alls th at are su p p o rted b y a th ick en ed ed g e slab lo cated ad jacen t to th e ex istin g W est w all o f th e O

R G

I - A k

A N

G A rm o ry

W alls - S tru ctu ral E v alu atio n

R ep o rt - 2

M arch e 5 lease n o te th at th is letter o n ly ad d resses th e tw o , fire d am ag ed , tilt u p co n crete w all p an els o n th e

W est w all o f th e O R

G . T h is letter d o es n o t in an y w ay ad d ress an y o th er p o rtio n o f an y o f th e facilities o n th is p ro p erty at th e ab o v e-referen ced ad d ress.

P lease co n tact u s if y o u req u ire ad d itio n al in fo rm atio n co n cern in g th e stru ctu ral cap acity o f th e fire d am ag ed co n crete w alls at th e ab o v e referen ced p ro ject lo catio n

R esp ectfu lly

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R G an d

A D

D w ith fire d am ag ed areas lo cated ictu res o f fire d am ag ed areas an d in terio r fin ish es

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W est W all-O R

G

W all 'A'

W all 'B'

AD

D

-Fire D am age Area marie Oval marie Polygon marie Line marie Line marie Line marie Line marie Line marie Line marie Line

AD

D

, D am aged by Fire

Front Entrance of Arm ory

G arage D oor

N atural G as riser in ground

Area inside R ed outline is the original footprint of the Arm ory built around

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Fire D am aged area of Tilt U p w alls

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W all 'B'

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Plan N orth marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Line marie Polygon marie Polygon marie Line marie Line marie Line marie Line

I - A k

A N

G A rm o ry

W alls - S tru ctu ral E v alu atio n

R ep o rt - 1

M arch

A ttach m en t A m o d

P ag e 1 f 2 est H o le –

W all ‘B

In sid e F ace W est P atch

W all ‘B

I - A k

A N

G A rm o ry

W alls - S tru ctu ral E v alu atio n

R ep o rt - 1

M arch

A ttach m en t A m e 2 f 2

W all ‘B

’ w ith

T est P atch an d W all ‘A

W all ‘B

’ L o o k in g N o rth w ith

G arag e D o o r

W all ‘B

’ an d W all ‘A ’ L o o k in g S o u