Technical Booklet - Building Control NI

1 StructureTechnicalBookletDOctober2012 Finance andPersonnelDepartment (NorthernIreland)2012 GuidancepageIn tr odu cti onTechnicalBookle ts3 This Tech nical Booklet3 Protect ed build ings4 Other leg islat ion4Pa rt D Reg ulations6 Guid anc e Performanceand introductionto provisionsRegu latio n 30 in Pa rt D - Sta bi lity7 Regu latio n 31 in Pa rt D - Disprop ort iona te collaps e9 Sect ion 1 GeneralGene ra lly10 Defin ition s10 Sect ion 2 Codesand standardsrelevantto all buildingtypesDem onstr atin g compliance with regulatio n 30 in Part D - Stabil ity12 Loa ding

2 S12 Des ign and const ru ction12 Dem onstr atin g compliance with regulatio n 31 in Part D - Disprop or ti onate collapse13 Using altern ativ e code s an d stan dards to satisfyreg ulati on 30 in Part D14 All bu ilding s14 For single fa mily house s an d smal l buildings15 Sect ion 3 Disproportionate collapseApp licatio n16 Proced ure16 Mea sur es requir ed to en sur e ro bust ness18 ContentsStr uctu reTechnicalBookletD: 201 21 Houses,annexesand small single storey buildingsSecti on 4 Single family houses,annexesand small single storey buildingsAppli catio n an d pr ese nta tion224A Basic requ ire ments for stability23 Gene ra l234B Timber floor, ceilingan d ro of me mbers in a house24 Det ermina tion of dime nsion s of ti mber members24 Spans.

3 Sizes and spacin gs fo r timb er members27 Floor joist s29 Ceilingjoist s an d bind er s sup po rti ng ceili ng joists32 Raf ters and pur lins suppo rtin g raf te rs35 Flat ro of joists48 Purli ns sup portin g dec king or shee ti ng554C Masonry wa lls. Part 1 - Maso nry wal ls for houses58 Gene ra l58 Conditionsre latin g to the bu ilding60 Gene ra l con ditio ns60 Conditionsre latin g to the wa ll65 Const ruct ion ma te rials and wor kman shi p66 Loadin g on wa lls69 Wall restr aints - Ver tical re stra int by butt re ssing wall s, pi ers and chi mneys71 Wall restr aints - La te ral re str aint by fl oors and roofs73 Open ing s, rece sses , over han gs and chases77 Wall thickness794C Masonry wa lls.

4 Part 2 - Maso nry wal ls for annex es and smal l singl e storey buil dings81 Appli catio n of this Par t of the Secti on814D Masonry chimneys86 Propo rt ion s fo r ma sonry chim neys abov e the roof surface864E Concr et e fo un dat ions87 Strip fo un datio ns of pla in concr ete87 App endi x Pub licationsreferredto912 Techni cal Bookl et D: 2012 Str uctureStr uctu reTechnicalBookletD: 201 2 Tec hni ca l Bookl et sTh isTech nical Bookl et, whi ch ta ke s eff ect on 31st October2012, is one of aseries tha t has be en prep ared by th e Depar tmen t of Fi na nce and Pers onnel(th e Depar tmen t) fo r the pur pose of provi ding pract ical guidancewithresp ect to the tech ni cal req ui re men ts of the Bui ldi ng regulations (N or th ernIre land ) 201 2 (the Building Regu lat ions).

5 At the ba ck of ea chTech nical Boo klet is a list of al l the TechnicalBookl etsthat ha ve been pre pared and publ ished by the Departmentfor this purp e guida nce giv en in aTechn ical Booklet incl ud es perfor mancestanda rdsand desig n pro vision s re lati ng to compl iance with specif ic aspectsof th eBuild ing Regu latio ns fo r th e more commonbuildi ng the guid ance in aTe chni cal Booklet is foll owed there will be a presumptionof complian ce with th e req uire me nt s of those BuildingRegul ati on s cov er edby tha t guida nce.

6 Howev er, th is presumptioncan be ov ertur ned, so simplyfo llowin g the gu ida nce doe s not guarantee compl iance. For example,if aparticu lar circum sta nce is no t on e of the more commonbu ilding situati onsthe desig n pro vision s give n in th eTechnicalBookletmay no t be re ar e lik el y to be alte rnati ve ways of demo nstratingcompl ianc ewit h the rel eva nt requirements of th e Build ing Regu lati ons other thanby fol low ing a desi gn pro vis io n given in aTechni cal Boo kl et.

7 There isther ef ore no obl ig atio n to ad opt any par ti cular pro vi si on set out in aTe chnica l Book le t, shou ld yo u deci de to co mpl y in so me other way .How ev er ,you wi ll have to demons tr ate th at your alternativeso lu tionmee ts the rel eva nt requ ir em en ts of th e Buil ding Reg ulation s by th oseot her mea sTe chni cal Boo kle tRequir em en tsTh e guida nce cont ai ned in th isTe chnical Bookl et relatesonly to thereq uir em ent s of regu lat ions 30 an d 31.

8 The wor k will also hav e to com plywith all ot her relev ant re qu ireme nt s of the Buildi ng ter ia ls an d wor kman shipAny buildin g wor k which is sub ject to requirements imposedby Part A of theBuild ing Regu latio ns shou ld be carri ed out in accordancewith regulation 23of those regu lat ion s. Gui dan ce on meetingthese requi rementsfor mate rialsand wor kmanship is gi ven inTechn ical Bookl et B which suppor ts Par t Building Reg ul ati on s are mad e for speci fic pur poses,pr imar ily securingthe he alt h, safet y, wel fa re an d convenienceof peopl e and for theconse rva tion of fue l an d powe r.

9 Sta ndardsand technicalapprovals arereleva nt gu idan ce to the exte nt tha t they relate to these ever,the y may also addre ss oth er asp ects of perfor mancesuch as ser viceability,or asp ect s which al th oug h th ey re lat e to hea lth and saf ety are not coveredby th e Build ing Regul ati on stand ard sWher e th isTech nica l Booklet mak es referenceto a na med standard, there leva nt ve rsio n of th e sta nd ard is the one listed in the , ifthis ve rsio n has bee n re pl aced or updat ed by the issuingstanda rds body,the ne w ve rsion ma y be use d as a sourceof gui dance providedthat itcont inues to ad dress the re leva nt re quirements of the Buildi ng Regulati msTh e diag ram s in th isTechn ical Booklet supplementthe text.

10 They do notshow all the de ta ils of const ru cti on and are not intendedto illust ra tecomplian ce with an y oth er re qui re me nt of the Buildi ng Regulati ons .They arenot ne cessar ily to scal e and should not be used as wor king details .Prot ec te d bui ld in gsDistrictcouncils have a duty to ta ke accountof the desirability to preser vethe cha ract er of prot ected bu ildings when carr ying out their functi ons und erBuilding Reg ulat ion fore , where wor k is to be carri ed out to apr ote cte d bu ilding to compl y with Part D or any othe r Pa rt of the Buil di ngRegu latio ns.