Building Construction_FALSE CEILING design

Building Construction

1. B U I L D I N G C O N S T R U C T I O N - I I I B . A r c h V I / I I I 7 . F A L S E C E I L I N G D e p a r t m e n t o f A r c h i t e c t u r e Pokhara E n g i n e e r i n g C o l l e g e

2. 7. F A LSE C E I LING INTRODUCTION • Fal s e ceiling is a seconda r y ceiling, h u ng b el ow t he m ain ( s t ruc t ura l ) cei l in g . • They may also be cal l ed d r op ceil i n g , fal s e ceili n g , o r s u s p ended ceiling. • The area abo v e t he d r opped ceiling is c a ll ed t he plen u m s p ace , as it is us e d f o r H V A C ( He a t in g , V e n ti l a tion, and Air Con d it i onin g ) and com m only us e d t o conceal pip i ng , wir i ng , and duc t wor k .

3. 7. F A LSE C E I LING • A t y pical d r opped ceiling consis t s of a g r i d- work of m e t a l chann el s in t he shape of an upsid e - d o wn "T“ s u sp e nded on cei l in g . • The s e chann el s snap t o g e t h e r in a regu l arly spac e d pa t tern – t y pical l y a 2 ’ ×2’ or 2 ’ ×4’ g r i d . • Each ce l l is f il l ed wi t h l i g h t w e i g ht " t il e s ’’ or "pan e l s " which simp l y d r o p i n t o t he g r i d . • T i l es can be s el ec t e d wi t h a v ar i e t y of ma t e r i als, incl u d i ng wo o d, m e t a l , p l as t ic, or mineral f i b e rs. • M o st t ile ma t eri a l is easily cut t o al l o w f i x t ures in o t her shapes, s u ch as incan d e s ce n t l i g h ts , sp e ak e rs, A C ou t l e ts and f i re sprinkl e r h e ads.

4. 7. F A LSE C E I LING PURPOSE • I t imp r o v es aes t h e tical appear a nce ( f o rm, color, t re a t m e n t e t c . ) and pr o po r t i o ns by managing r o o m h e i g h t s. • Concea l ed t he s t r u ctur a l m e mber l ike: beams e t c. • Pr o v i d es insu l ation f r om hea t . • A cous t ic a l impr o v e m e n t.

5. 7. F A LSE C E I LING TYPES OF FALSE CEILING A. E X POSED OR LAY-IN GRID • A s y s t em wh e re t he g r id is v is i b l e and in t o which pane l s are l ai d . • Pane l s a r e o f ma t e r i a l s in c l ud i ng mineral/r o ck f i ber, g l ass f i ber, p l as t er b oa r d, calci u m silica t e, glass rein f o r ced g y ps u m, wo o d, s t eel and a l u m in u m . • The sys t em is r a pid t o ins t all and c a n p r o v i d e a hi g h d eg r ee o f access t o t he cei l ing v o i d. • Grid sys t ems are, g e n era ll y , an in v er t e d ‘T’ desi g n, wi t h a t able ( expos e d fa c e) w i d t h of 15 or 2 4 m m . • They a r e r o ll ed f r om g a l v anized s t e e l s t r i p.

6. 7. F A LSE C E I LING I I 24mm g r i d & rebated edge pa ne l 24mm gr i d & square edge pane l 1 5mm gr i d & r e bat e d e d ge pan e l g r i d & r e b a t ed edge p a n e l 1 Smm profi l e d Common size o f g r i d a r e 1 2 x 6 0, 600 x 6 and 500 x 5 m m. B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

7. 7. F A LSE C E I LING T y p i ca l e x posed gr i d arrangment

8. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

9. 7. F A LSE C E I LING TYPES OF FALSE CEILING B. C O NCEALED GRID • This t y pe of d r o pp e d cei l ing e m p l o y s a m e t hod of in t er l ock i ng pan el s in t o each o t h e r and t he g r id wi t h t he u s e of s m a l l s t r i ps of me t a l cal l ed ' sp l ines ' , • K e y pa n el ( u s ua l l y i n t he co r n e r) i s u s e t o ga i n access abo v e t he cei l ing wi t ho u t dama g ing t he ins t a l l a tion or t he pan el s, whi c h c a n be remo v ed, al l o wing f o r t he o t her pane l s t o be s l id out of t he g r i d . • D i sad v antages - d i f f icu l t y in re m o v ing and rea t taching pan el s f r o m t he g r i d , whi c h i n some cases can cause i r repa r able dama g e t o t he pan el s re m o v ed.

10. 7. F A LSE C E I LING The sys t em most common l y compr i s e s gal v anized s t e e l ‘Z’ s e c t i o ns f i xed w i t h c l ips t o a pr i mary n e t work of g a l v anized s e c t i o ns. chann e l T i l es a r e man u f a ct u r e d f r o m a v a r iety o f m a t e r i a l , g l ass f i ber, g y ps u m boa r d and wo o d. Com m on sizes of t il e s are 3 x 3 and 6 x 6 0.

11. 7. F A LSE C E I LING

12. 7. F A LSE C E I LING MATERIALS The ma t e r i a l s shou l d ha v e sp e ci f ic p e r f o r mance and app e arance. charac t eri s tics A . Fib r ous pla s ter board: • P l as t er b oa r d is m ade of g y ps u m p l as t e r rein f o r ced wi t h f iber g l ass e v e nl y d i s t r i b u ted t hr o ughout s e c t i o n t o inc r ea s e i t s s t rength. • F i br o us p l a s t e r i s us ua ll y c a st i n t o a m o u l d t he n us e d i n s l a b s , C e i li n g b oa rds for f a l se ce i l i n g • T h i ck n e ss 9m m , 12mm, 19mm B u i l d i n g c o n s t r u c t i o n - I I I

13. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I Process

14. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I Process

15. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I

16. 7. F A LSE C E I LING B. Gyp s um pla s ter boa r d: - Gyps u m is a cr y s t a ll ine combina t i o n of calcium s ul pha t e and wa t er. - I f pow d ered g y psum i s he a t e d t o 170 ˚ C i t l o o s e s a bo u t 3 / 4 pa r ts of w a t e r a nd call e d as "hemi - hy d rate g y psum and common l y known as p l as t e r of par i s . " - V ery rap i d s e t ting t ime o f about 1 min u t e - Gypsum p la s t e r boa r d consists of co r e of set g y psum p la s ter e n c l osed i n and bon d ed t o t wo sh e e t s o f h e a v y pap e r - Thickness - 9 . 5mm , 12 . 5mm , 15m m & 19mm B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

17. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I

18. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I

19. 7. F A LSE C E I LING Constru c tion T e chnol o gy M o st s u sp e nded cei l in g s are cons t ruc t ed or i ns t a ll e d as a con t inuous opera t i o n. They a r e: • Se t ting o ut p o in t s and e l e v a ti o n benchmarks a r e i d en t i f ied and re l at e d t o desi g n/ l a y out d r awings. • Design d i m e nsions a r e ch e ck e d ag a inst ac t ual cons t ruc t i o n. • Fin i sh e d cei l ing heigh t s are e s t a b l ish e d and re l a t e d t o ins t a ll e d s e r v ices and t he c l earance req u i r ed f o r t he cei l ing s y s t em • The re l ative h e i g ht of t he cei l in g /p e r i m e ter in t erface can al s o be ch e ck e d. B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

20. 7. F A LSE C E I LING • Se t ting out of t he cei l ing wi t h t he u s e of s t r i ng l ines and/ o r l as e rs wi t h par t icular e m phasis t o e s t abl i shing ‘ s q u ar e ’ refere n ce l ines. • I ns t al la tion of t he p e r i m e t e r de t ail. • The posi t i o n of f i x in g s in t o t he s t ruc t u r a l so f f i t is d e t er m in e d and ins t a l led. • Hangers are a t tached t o t he so f f i t f i x i ngs. • The cei l ing g r i d is i ns t a ll e d and pan el s p l aced B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

21. 7. F A LSE C E I LING Advantages: • Fi r e Safety C e iling t il e s m ade f r om min e ral f i b e rs, o r f i r e -ra t ed wo o d pa n e l s can be u s ed wi t hin t he cons t ruc t i o n t o m e e t accep t able s t anda r ds/r a tings. • Ea s e of modific a ti o n Ea s ily - re m o v e d cei l ing pane l s o f fer ins t ant access t o t he g r ea t l y simp l i f y ing r e p ai r s or m o d i f ic a t i o n. p l e n u m , B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

22. 7. F A LSE C E I LING Disadvantages: • D r opped cei l ing s y s t em reduc e d h e ad r o o m • Hi d e s t ruc t u ral damage, loose wir i ng, insect in f e s t ation, a v o i d i ng t he n e ed t o car r y o ut any repairs or main t e n a nce B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

23. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

24. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

25. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

26. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

27. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I

28. 7. F A LSE C E I LING B u i l d i n g c o n s t r u c t i o n - I I I B . A r c h I I / I I