Ventilation - Product Guide Vol 19/a

1 VentilationPRODUCT Guide volume 19/aventilationproductsfor roofs, walls and floorsCl/SfB( )(47) alternative listingVentilationPitched roof - above 15 Pitched roof - below 15 Mono pitch roof - above 15 Mono pitch roof - below 15 10mm gap10mm gap25mmgap10mmgap25mmgap5mm gap5mm gap25mmgapFlat roof - cold deck25mmgap25mmgapFlat roof - abutmentCeiling following pitch of roof25mmgap25mmgap25mmgap25mmgapUnder floor and void ventilationCavity and compartmented /fire stopped sectionsReferences: Approved Document 5250. BRE Report Document C 2004 5534. NHBC Standards. Zurich Standards.

2 Scottish cold roofs should crossventilate. The equivalent of a 10mmgap running continuously the fulllength of both eaves is usual. Onpitches above 35 where the spansexceed 10m consider also higher-level (equivalent 5mm) additionalventilation as defined in slope (monopitch) roofs maybe ventilated (equivalent 10mm) ateaves and (equivalent 5mm) atroof/wall intersection or ensure every Ventilation routeis cross balanced - with entry andexit the insulation follows the roofslope observe the increased aperturerequirement at eaves and the needto maintain a free air space abovethe sloping ceiling.

3 The ventilationlevel at the top of the roof is cold roof situations where the roofpitch is below 15 cross ventilate using(equivalent 25mm) rated products. On spans exceeding 10m observeApproved Document F2 guideline byincreasing Ventilation x of roof(plan) Aspirating Underlay may beused in cold and warm roofs to providethe requisite level of Ventilation as analternative method of any need to cross-batten iscarried out if applicable. Productinstructions provide guidelines. Suspended floors generally require aminimum of a 150mm void under andbalanced cross Ventilation .

4 Theequivalent of 1500mm2airflow for eachmetre run of wall is usual or 500mm2for every square metre of floor area whichever is the greater. Pipes of notless than 100mm diameter may service airflow to voids formed bycompartment or sleeper walls. In suchcircumstances select the compatibleconnections to appropriate straight orcranked telescopic wall ventilatorsdetailed in this Product Space VentilationWe welcome you to the range ofbuilding envelope ventilationproducts by Cavity Trays to negate the effects ofcondensation in roofs, walls andfloors is necessary to comply withthe requirements of the BuildingRegulations and British selection of products isalways recommended to optimiseventilation levels and performance.

5 Roof Wall or Floor is highlightedat the top of every Product listingindicating where the Product maybe the bottom of every productentry are simple illustrationsproviding a general Guide to thelevels of compliant ventilationunder the current BuildingRegulations. Examples of all suchillustrations are shown below. Construction standards vary andso do Product standards. Alwayscheck compliance and suitabilityprior to using a type codes within each section are listed in alphabeticalorder. In some instances, products are then grouped by : Under W the Type W caviweep is then followed byother types of ProductsCavibrick01 Cavibrick Sleeves01 Cavibrick Rectangular to Round Converter Sleeve02 Sleeve and Duct Cavitrays02 Type TAV03 Extension Sleeves03 Type TAV to Round Converter04 Type CSV04 Type CRSV05 Type CV05 Type ECF06 Type EROV 300/40006 Type ERV07 Type FFFV07 Type OEVWF08 Type OEVWF-2508 Type OFV-1009 Type OFV-2509 One-Way (heavy duty)10 One-Way (maximum)

6 10 Type PV11 Type RASV11 Type RAV-FL12 Type REV12 Flush Slate Ventilator13 Contract Slate Ventilator13 Universal Roof Ventilator14 Type SSV14 Type SSV-RU15 Type SSV-1515 Type SV-FL16 Type SV-GP16 Type T 17 Three in One Roof Ventilation Kit17 Type USV 18 Type VEP18 Ventilation Packs19 Ventilating Flashing19 Type W20 Type W Extension Duct20 Type W Render Cover21 Euroweep-vent21 Ventilation Guidelines*Alternative optionphone01935 474769 fax01935 428223 Sleeves useThe cavibrick is a highperformance ventilator which maybe used instead of a to brick dimensions,the cavibrick promotes a high airthroughput, via a front louvredgrille.

7 The louvres are proportionedto maximise performance whilstcontouring the air to challengethrough-draughts. The louvres arealso spaced to comply with thelatest BS requirements but havebeen staggered to offer also aninsect resistant screen which isnot offered on some standardairbricks. The cavibrick incorporates awater dam back to prevent rainpenetration and crossflowseparators. Moulded in a range of colours, the cavibrick may beused singularly, or in cavibrick is fully compatiblewith our range of telescopic andstraight BS polypropylene, in terracotta,slate, beige, brown, white andblack.

8 Approx. size 220mm x 60mmx 70mm. Free airflow up to 7,500mm2per cavibrick. May be used singularly orclipped together to create 150 x 225 and 225 x 225mmsized airbrick assemblies. Packed in boxes containing50no. Smaller quantities available. Attachments available attachments to provideventilation to specific range of straight sleeves toaccommodate one, two or threecavibricks. (High throughputcavibricks are designed to beused singularly or can be lockedtogether to form larger brick-sizedventilating units.) When connected to a cavibrickthe combined length is sufficientto accommodate all popularcavity wall widths.

9 The threestandard straight sleeves are:75mm x 225mm, 150mm x225mm and 225mm x 225mm. We recommend sleeves areprotected with a cavitray wherethey pass through the cavity, tocomply with NHBC/best practice.(See Sleeve and Duct Cavitrays.)data Black polypropylene. Length 300mm. Special lengths to order. 75mm x 225mm, 150 x 225mm,225mm x 225mm. Fold-flat design minimisesstorage space. Packed in boxes containing50no. Smaller quantities high performance air-brick High air throughput Insect screening Self-draining base Clip together to make up composite sizes Range of colours Range of sizes Compatible with Cavibrick Fold flat storage Unobstructed airflow2 brick sleeve 150mm x 225mm1 brick sleeve 75mm x 225mm3 brick sleeve 225mm x 225mmConsider for use where shown.

10 See inside cover for key. Consider for use where shown. See inside cover for key. usePermits cavibrick to be connectedto standard it is proposed to provideventilation to a remote room,under floor area or void, arectangular to round convertersleeve is available to permit theuse of standard 100mm nominalplastic soil pipe. The cavibrick promotes excellentair throughput that can beconveyed using standard pipe ifso required. We recommendsleeves are protected with acavitray where they pass throughthe cavity, to comply withNHBC/best practice. (See Sleeve and Duct Cavitrays.)