Thatched Roofs – Separation in Construction Thatch Alert Thatchbatts ® Fire Retardant Spray Thatch Fireboard Thatch Firewall Membrane FIRE PROTECTION SYSTEMS 8LEXGLMRK%HZMWSV]7IVZMGIW THATCH OVERVIEW Statistically, homes with thatched roofs are RSQSVIPMOIP]XSGEXGL½VIXLERXLSWI[MXL GSRZIRXMSREPVSSJWMJXLIS[RIVMWQEHI E[EVIERHYRHIVWXERHWXLIVMWOSJXLEXGL½VI ,S[IZIVMJEXLEXGLIHVSSJHSIWMKRMXIERH MWEPPS[IHXSHIZIPSTMX´WEPQSWXMQTSWWMFPI XSGSRXVSPERHXLIVIWYPXWGERFIHIZEWXEXMRK TAS OVERVIEW *SVSZIV]IEVW[ILEZIHIZIPSTIHGPSWI working relationships with many of the leading insurance companies, test houses and product manufacturers and as part of the GSRXMRYSYWJIIHFEGOXLEX[IVIGIMZI[ILEZI GSRXMRYIHXSHIZIPSTSYVVERKISJ½VIFEVVMIV W]WXIQWXLEXGERFI½XXIHXSFSXLRI[ERH I\MWXMRKXLEXGLIHVSSJW8LIWIEGXXSGVIEXIE separation between the thatch and the roof XMQFIVWMRXLIIZIRXSJE½VI )ZIRXLSYKLIZIV]XLEXGL½VI[MPPZEV]HYI to many things such as weather conditions, location of property, thickness of the thatch IXGXLIOI]SFNIGXMZISJER]½VIFEVVMIV W]WXIQMWXSFY]QSVIXMQI By joining forces and sharing skills, knowledge and information, we can all play a part in reducing the risk to the occupants and the many listed buildings that in most cases are EPQSWXHIWXVS]IHEWEVIWYPXSJEXLEXGL½VI This will also help to maintain the thatching industry and continue to promote the desirability of owning a thatched house whilst at the same time helping to protect our LIVMXEKIJSVJYXYVIKIRIVEXMSRW COMMON CAUSES 8LEXGLVSSJ½VIWGERFIEXXVMFYXIHXSQER] different causes ranging from old or faulty electrical systems through to the likes of FSR½VIWSV½VI[SVOW,S[IZIVMXMW[MHIP] accepted that there are two main causes SJXLEXGL½VIW[LMGLEVIFSXLMRVIPEXMSRXS chimneys and the use of wood burning or QYPXMJYIPWXSZIWXLIWIGEYWIWEVI Continued >> Listed Heritage Magazine July/August 2014 83 THATCHED ROOFS © Master Thatchers (North) Ltd Heat Transfer – Wood burners and multiJYIPWXSZIWGERKIRIVEXIZIV]LMKLKEW temperatures; this in turn can be transferred through the brickwork of the chimney to XLIXLEXGLXLMWMWORS[REW,IEX8VERWJIV ,IEX8VERWJIVMWJYVXLIVMRGVIEWIHEXXLI point that the thatch meets the chimney; this is due to the insulating properties SJXLIXLEXGLMRKQEXIVMEP 8LI,IEX8VERWJIVTVSGIWWGERGEYWIXLEXGL to smoulder and ignite if temperatures in I\GIWWSJ'EVIVIEGLIH7XYHMIWWLS[ XLEX[SSHFYVRIVWERHQYPXMJYIPWXSZIW being installed into thatched properties EVIEQENSVGEYWISJXLEXGL½VIW This is mainly due to faulty chimneys, poorly SVMRGSVVIGXP]½XXIHPMRIVWGSQFMRIH[MXLLMKL ¾YIKEWXIQTIVEXYVIWFIMRKKIRIVEXIHF] XLIWIIJ½GMIRXWXSZIW Worse still, the thatch is at a much greater VMWOSJXLIIJJIGXWSJ,IEX8VERWJIVMJXLI chimney is not lined, additionally the transfer process can be accelerated if the condition of the brick work or mortar has degraded SZIVXLI]IEVW 84 Listed Heritage Magazine July/August 2014 Ejected Embers or Sparks – Embers or WTEVOWI\MXMRKXLIGLMQRI]LEZIFIIR EGGVIHMXIHXSXLIGEYWISJQER]XLEXGL½VIW ERH[LIRMRZIWXMKEXMSRWLEZIFIIRGSQTPIXIH JSPPS[MRKEXLEXGL½VIMXLEWFIIRMHIRXM½IH XLEX½VIW[IVIVITSVXIH[MXLMRQMRYXIW SJE½VIFIMRKPMXSVFIMRKVIJYIPPIH Other chimney related Issues – Many chimneys are not lined correctly, for I\EQTPIMJE¾I\MPMRIVMWMRWXEPPIHMRGSVVIGXP] and is therefore allowed to touch the side of the chimney it can cause a hot spot, which in turn will dramatically accelerate the TVSGIWWSJLIEXXVERWJIV 7IZIVEPMWWYIWGERMRGVIEWIXLIVMWOSJXLI effects from ejected embers or sparks, these MRGPYHI Bricks missing, it is impossible to fully check the condition of the chimney at the point that it passes through the thatch, useless the thatch MWVIQSZIHSVTSWWMFP]ERMRXIVREP''8:X]TI WYVZI]MWGSQTPIXIH • Spark Arrestors – If not cleaned at least once a year they can clog up and will catch ½VIMRXLIMVS[RVMKLX[LMGLMRXYVRGSYPH GEYWIEXLEXGL½VI 'LMQRI],IMKLX¯8LIVMWOSJEXLEXGL½VI is further increased when the chimney height has been reduced following many years of recoating works, this is more common with thatching materials such EWPSRKWXVE[ Education – It is still a fact that many thatch ½VIWGSYPHLEZIFIIRTVIZIRXIHMJQSVI MRJSVQEXMSRLEHFIIRKMZIRXSXLITVSTIVX] S[RIV[MXLEZMI[XSIREFPMRKXLIQXSLEZI a better appreciation of good practice, such as how to use and maintain appliances and WIPIGXXLIGSVVIGXJYIPW Continued >> WALROND & COMPANY CHARTERED BUILDING SURVEYORS www.walrondsurveyors.com BARRETT CORP HARRINGTON HARRINGTON appliance ks ut behind ea br re Fi m 07.24a a t en. Family wner a k d Pr p tty O 0 i g asks th O y rt Li t d Prope j er an ‘Ar we ins ough?’ =hgm`^mlmn\dhgJn^lmbhg+' = hg gm`^mlmn\\ddhgJn^lmbh b g+' THE GRANARY, PIPPINS FARM, PEMBURY, THNBRIDGE WELLS, TH2 4AB Tel: 01892 709600 Email: [email protected] ;<AaZlma^^qi^kmbl^mhikhob]^Z\\nkZm^[nbe]bg`bglnkZg\^ ; <AaZlma^^qi^k mbl^mhikhob]^Z\\nkZm^[nbe]bg`bglnkZg\^ o ZenZmbhglmaZm^ebfbgZm^ma^kbldh_ng]^kbglnkZg\^' oZenZmbhglmaZm^ebfbgZm^ma^kbldh_ng]^kbglnkZg\^' A ^eibg`Eblm^]Ikhi^k mrHpg^klmhaZo^hg^mabg` A^eibg`Eblm^]Ikhi^kmrHpg^klmhaZo^hg^mabg` ee^llmhphkkrZ[hnm' ^llmhphkk rZ[hnm' ppp'[\a'nd'\hf)1---*+--2. p pp'[\a'nd'\hf)1---*+--2. Listed Heritage Magazine July/August 2014 85 THATCHED ROOFS SOLUTIONS With changes in building regulations and ZEVMSYWKYMHERGIRSXIWXLIVIMWEKVIEXHIEPSJ confusion relating to suitable chimney systems, ½VIFEVVMIVWERHVIXEVHERXWXLEXGERFIYWIH JSVXLEXGLIHTVSTIVXMIW Chimneys – Chimneys are a big area for concern and needs to be the main area for the property owner to consider if they are planning to use a wood burning or multi-fuel WXSZISVIZIRERSTIR½VI-RXLI9/MJE new appliance is installed, then the complete installation to include the liner and the height of the chimney has to comply with current FYMPHMRKVIKYPEXMSRWEWHIXEMPIHMR%TTVSZEP (SGYQIRX. © Thatching Advisory Services A suitable liner is a must for any operational chimney in a thatched property, especially [LIRE[SSHFYVRMRKSVQYPXMJYIPWXSZIMW FIMRKYWIH;I[SYPHEPWSVIGSQQIRHXLEX TVSTIVX]S[RIVWXLEXEVIR´XTPERRMRKXSMRWXEPP RI[ETTPMERGIWWXMPPWIIOEHZMGIJVSQXLIPMOIW SJ7SPMH*YIP%WWSGMEXMSRSV,)8%7MJXLI] LEZIER]GSRGIVRW Many of the specialist insurance companies IMXLIVVIUYMVIE''8:GLMQRI]WYVZI]SV XLI]SJJIVXLMWEWERSTXMSR+MZIRWSQI SJXLIMWWYIWEPVIEH]QIRXMSRIHEFSZI[I would always recommend that this is a good TVIGEYXMSRJSVER]LSQIS[RIV © Thatching Advisory Services Other causes – In addition to chimneys and liners other areas for consideration should include checking electrical systems, WQSOIEPEVQW½VII\XMRKYMWLIVWIXG3YV [IFWMXIGSRXEMRWEHZMGIXSLIPTXLITVSTIVX] owner address and consider what precautions XLI]GERXEOIXSVIHYGIXLIVMWOSJE½VIMR XLI½VWXTPEGI-REHHMXMSRXSXLIMRJSVQEXMSR EZEMPEFPISRSYV[IFWMXIQSWX9/*MVI 6IWGYI7IVZMGIWTYFPMWLE³8LEXGL-RJSVQEXMSR 4EGO´[LMGLKMZIWYWIJYPHIXEMPWERHEHZMGI as to how the owner can reduce the risk SJE½VI Fire Barriers – Reasons to Install: Physical Fire Barriers for thatched roofs are designed to create a separation between XLIXLEXGLERHXLIVIWXSJXLIFYMPHMRK8LI TVMRGMTPIMWXLEXMRXLIIZIRXSJE½VIXLI XLEXGLMWWIIREWWEGVM½GMEP 86 © Thatching Advisory Services 3RI\TSWYVIXSWTEVOWJVSQGLMQRI]W FSR½VIWSVFEVFIUYIW8LEXGLWE]J[MPP intumesce and form a carbonised char, which binds the thatch stems together, cutting off XLIWYTTP]SJS\]KIRXSXLI½VIHIPE]MRKXLI WTVIEHSJ¾EQIERHPS[IVMRKXLIVEHMEXIH LIEXSYXTYX %PXLSYKLWSQIFEVVMIVWEVIWSPHMRHMZMHYEPP] [IWYKKIWXEQM\SJIMXLIVXLI8%78LEXGL Fireboard or the Thatch Firewall Membrane for integrity and the non-combustible 8LEXGLFEXXJSVMRWYPEXMSR SUMMARY 4VIZIRXMSRMWXLIFIWXWSPYXMSR Fire Retardant Sprays – TAS Thatchsayf Fire Retardant Spray can be applied as a WXERHEPSRITVSHYGXSVMREHHMXMSRXSLEZMRK ETL]WMGEP½VIFEVVMIVW]WXIQMRWXEPPIH &YXSRXLIFEWMWXLEXMJE½VILETTIRWE½VI barrier system will help to reduce the amount of damage and will create a safer working IRZMVSRQIRXJSV*MVI 6IWGYI7IVZMGIW Listed Heritage Magazine July/August 2014 8LEXGLMRK%HZMWSV]7IVZMGIWLEZIWTSOIR EXERYQFIVSJIZIRXWERHGSRJIVIRGIWSZIV XLI]IEVWERH[IWXVSRKP]FIPMIZIXLEXFIXXIV education and awareness is required, to increase awareness and help to reduce the VMWOWEWWSGMEXIH[MXLXLEXGLERH½VI *SVEHHMXMSREPEHZMGIERHTVSHYGX HIXEMPWTPIEWIZMWMX[[[ XLEXGLMRKEHZMWSV]WIVZMGIWGSYO SVGSRXEGXEREHZMWSVSR Thatched Property Surveys Understanding Thatched Roofs Courses Traditional Sash Windows Solid timber glazing bars with super slim and discreet sealed unit double glazing. Blown glass option. If this is not accepted for Planning Applications, nothing will be. See why you are in safe hands: www.boxsash.com · 01753 858196 email: [email protected] Master Thatcher and Residential Property Surveyor specialising in:z z z z Home Condition Surveys of older and historic properties. Thatched properties built of Cob or Stone. Thatch Consultant. Custom Thatched Roof Surveys. RICS Understanding Thatched Roofs course - the only course that trains surveyors how to survey thatch in UK. z Weekend “Hands on” Thatching Courses. Associate Member www.thatchedhomeinspector.co.uk · T: 01647 231 706 E: [email protected] Holland Park Farm, South Tawton, Okehampton, Devon EX20 2PP Listed Heritage Magazine July/August 2014 87
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