DuraVent DuraStack Installation User Manual

Page 7

CHIMNEY WEIGHT

Chimney.weight.is.given.in.pounds.per.foot.of.chimney.for.each.diameter...

It.is.important.to.know.the.weight.of.the.chimney.section.for.chimney.

support. or. guiding.. Chimney. weight. (table 8). along. with. maximum.

chimney.height.(table 6).are.necessary.to.calculate.the.proper.anchor.

strength.needed.with.wall.supports.(WS),.Anchor.Plate.(AP).supports.

and.Suspension.Bands.(SB).

NOTE:.DIAGRAMS.&.ILLUSTRATIONS.ARE.NOT.TO.SCALE.

Example: Model DIS, 6” diameter section of 25 feet in length from table 8,

weight in lb/ft = 8. Total weight 8 x 25 = 200 lbs

CHIMNEY GUYING AND BRACING

1.. Proper.guying.and.bracing.is.essential.for.part.of.the.chimney.that.

extends.above.the.roof.or.parapet.wall..The.chimney.at.this.point.is.

subject. to. wind. conditions. and. needs. special. attention. for. proper.

stabilization.

2.. If.the.stack.above.the.roof.does.not.exceed.dimension.H,.no.special.

guying.or.bracing.is.required...However,.to.protect.the.flashing.from.

lateral.movement,.a.guide.must.be.installed.at.the.roof.level..See.figure

7).

3.. For.stack.height.above.the.roof.that.needs.guying.or.bracing,.a.support,.

a.small.length.and.a.expansion.length.must.be.installed.near.the.roof.

level.to.absorb.the.thermal.expansion.and.minimise.this.effect.on.the.

guy.wires.or.brace...

4.. When.using.guy.wire,.the.cable.must.be.slightly.slack.or.loose.to.allow.

thermal.expansion.

5.. When.using.rigid.bracing,.the.maximum.vertical.height.between.sup-

ports.must.be.reduced.to.5’.to.compensate.thermal.expansion.

Figure 7 - Maximum freestanding chimney height

* If Dimension “H” exceeds the

value in table 7, use bracing or

cable guying to stabilize chim-

ney section above the roof. See

notes 3, 4, 5 and figure 8.

Figure 8 - Chimney height with rigid bracing or guying option

See table 7 for “H” dimensions

Support

Maximum Height

See table

Guide

No guying or bracing required

Maximum

height -

See table 6

Support

Expansion Length

Guide

Support

* Cables and roof anchors

designed for 30 lb. per

sq. ft. force on chimney

projected area.

Brace

Guy Cable * tensioners and

roof anchors * (by others)

5’ MAX

CHIMNEY WEIGHT IN LB/FT

Inside diameter

Model DIS

Model DAS

Table 8